| **CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (USD $)In Thousands, except Share data**       | Common Stock                                                                                                                       | Additional Paid-In Capital                                                                                                                                                                | Accumulated Deficit                                                                                          | Accumulated Other Comprehensive Income (Loss)                                                                               | Treasury Stock                                                                                          | Total                                                                                                       |
|--------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------|
| Balance, beginning at Dec. 31, 2013                                                                          | $ 79us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                   | $ 548,510us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                         | $ (466,677)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember | $ (192)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (2,741)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember | $ 78,979us-gaap_StockholdersEquity                                                                          |
| Balance, beginning (in shares) at Dec. 31, 2013                                                              | 61,025,000us-gaap_SharesIssued/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                   |                                                                                                                                                                                      |                                                                                                         |                                                                                                                        | (200,000)us-gaap_SharesIssued/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember       |                                                                                                        |
| Net loss                                                                                                     |                                                                                                                               |                                                                                                                                                                                      | (9,313)us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember          |                                                                                                                        |                                                                                                    | (9,313)us-gaap_NetIncomeLoss                                                                                |
| Compensation expenses for share-based payment arrangements                                                   |                                                                                                                               | 773us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember |                                                                                                         |                                                                                                                        |                                                                                                    | 773us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |
| Sale of common stock in public offering, net of underwriting discounts and commissions and offering expenses | 12us-gaap_StockIssuedDuringPeriodValueNewIssues/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                  | 37,443us-gaap_StockIssuedDuringPeriodValueNewIssues/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                         |                                                                                                         |                                                                                                                        |                                                                                                    | 37,455us-gaap_StockIssuedDuringPeriodValueNewIssues                                                         |
| Public Offering shares issued                                                                                | 8,750,000us-gaap_StockIssuedDuringPeriodSharesNewIssues/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember          |                                                                                                                                                                                      |                                                                                                         |                                                                                                                        |                                                                                                    | 8,750,000us-gaap_StockIssuedDuringPeriodSharesNewIssues                                                     |
| Balance, ending at Mar. 31, 2014                                                                             | 91us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                     | 586,726us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                           | (475,990)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember   | (192)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember   | (2,741)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember   | 107,894us-gaap_StockholdersEquity                                                                           |
| Balance, ending (in shares) at Mar. 31, 2014                                                                 | 69,775,000us-gaap_SharesIssued/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                   |                                                                                                                                                                                      |                                                                                                         |                                                                                                                        | (200,000)us-gaap_SharesIssued/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember       |                                                                                                        |
| Balance, beginning at Dec. 31, 2014                                                                          | 91us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                     | 589,826us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                           | (462,267)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember   | 0us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember       | (2,741)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember   | 124,909us-gaap_StockholdersEquity                                                                           |
| Balance, beginning (in shares) at Dec. 31, 2014                                                              | 69,833,000us-gaap_SharesIssued/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                   |                                                                                                                                                                                      |                                                                                                         |                                                                                                                        | (200,000)us-gaap_SharesIssued/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember       |                                                                                                        |
| Net loss                                                                                                     |                                                                                                                               |                                                                                                                                                                                      | (10,254)us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember         |                                                                                                                        |                                                                                                    | (10,254)us-gaap_NetIncomeLoss                                                                               |
| Compensation expenses for share-based payment arrangements                                                   |                                                                                                                               | 757us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember |                                                                                                         |                                                                                                                        |                                                                                                    | 757us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |
| Exercise of stock options                                                                                    |                                                                                                                               | 61us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                           |                                                                                                         |                                                                                                                        |                                                                                                    | 61us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense                           |
| Exercise of stock options (in shares)                                                                        | 12,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember |                                                                                                                                                                                      |                                                                                                         |                                                                                                                        |                                                                                                    |                                                                                                        |
| Balance, ending at Mar. 31, 2015                                                                             | $ 91us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                   | $ 590,644us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                                         | $ (472,521)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember | $ 0us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember     | $ (2,741)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember | $ 115,473us-gaap_StockholdersEquity                                                                         |
| Balance, ending (in shares) at Mar. 31, 2015                                                                 | 69,845,000us-gaap_SharesIssued/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                   |                                                                                                                                                                                      |                                                                                                         |                                                                                                                        | (200,000)us-gaap_SharesIssued/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember       |                                                                                                        |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of new stock issued during the period.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of share options (or share units) exercised during the current period.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of stock issued as a result of the exercise of stock options, after deduction of related income tax (expense) benefit.
+ References
No definition available.
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