| **CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (USD $)In Thousands, unless otherwise specified** | 12 Months Ended                                                                                     |
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| **CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]**                                      |                                                                                                |   |   |
| Net income (loss)                                                                                          | $ 4,410us-gaap_NetIncomeLoss                                                                        | $ (42,572)us-gaap_NetIncomeLoss | $ (35,431)us-gaap_NetIncomeLoss |
| **Other comprehensive income:**                                                                            |                                                                                                |   |   |
| Net change in unrealized loss on auction rate securities                                                   | 192us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 68us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 8us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |
| Total other comprehensive income                                                                           | 192us-gaap_OtherComprehensiveIncomeLossNetOfTax                                                     | 68us-gaap_OtherComprehensiveIncomeLossNetOfTax | 8us-gaap_OtherComprehensiveIncomeLossNetOfTax |
| Comprehensive income (loss)                                                                                | $ 4,602us-gaap_ComprehensiveIncomeNetOfTax                                                          | $ (42,504)us-gaap_ComprehensiveIncomeNetOfTax | $ (35,423)us-gaap_ComprehensiveIncomeNetOfTax |

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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
+ 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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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
+ References
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| - Definition
Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.
+ References
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