| **Impairment of Long-Lived Assets**            | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| **Impairment of Long-Lived Assets [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Impairment of Long-Lived Assets [Text Block]   | 9.               Impairment of Long-Lived AssetsWe evaluate assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. We measure the amount of any impairment by comparing the carrying value of the asset to market prices for similar assets. In connection with the amendment of the Company's Tarrytown lease, we recognized impairment losses of $347 on leasehold improvements and machinery and equipment removed from service, and those losses are included in Research and development expenses in our accompanying Consolidated Statements of Operations for the three and six months ended June 30, 2013. |

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| - Definition
Tabular disclosure of long lived assets held for sale. Disclosure may include the description of the facts and circumstances leading to the expected disposal, manner and timing of disposal, the carrying value of the assets held for sale, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760
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| - Details**Name:**us-gaap_PropertyPlantAndEquipmentImpairmentOrDisposalAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |