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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Number of shares excluded from the computation of net loss per share |  | 32,696,757 | 23,159,206 |
Foreign currency translation adjustment |  | $ 10,000 |  | $ 9,100
Cost of government contracts revenue | $ 2,700 |  | $ 8,100 |
Government Contract Receivable, Unbilled Amounts |  |  |  | 900
Reclassified from Other Non-Current Assets to Restricted Cash |  |  |  | 900
Restricted Cash and Cash Equivalents, Current |  | 31,521 |  | 34,964
Security Deposit [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Restricted Cash and Cash Equivalents, Current |  | 1,700 |  | 900
Grant Agreement [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Restricted Cash and Cash Equivalents, Current |  | $ 31,500 |  | $ 36,500
Convertible Debt Securities [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Number of shares excluded from the computation of net loss per share |  | 47,716,900 |  |

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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