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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 Warrant Liabilities [Member] | Mar. 31, 2013 Warrant Liabilities [Member] | Mar. 31, 2014 Warrant Liabilities [Member] Minimum [Member] | Dec. 31, 2013 Warrant Liabilities [Member] Minimum [Member] | Mar. 31, 2014 Warrant Liabilities [Member] Maximum [Member] | Dec. 31, 2013 Warrant Liabilities [Member] Maximum [Member] | Mar. 31, 2014 Recurring [Member] | Dec. 31, 2013 Recurring [Member] | Mar. 31, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mar. 31, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Mar. 31, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  |  |  |  |  | $ 63,561 | [1] | $ 82,759 | [1] | $ 63,561 | [1] | $ 82,759 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1]
U.S. treasury securities |  |  |  |  |  |  | 19,996 |  | 19,990 |  | 19,996 |  | 19,990 |  | 0 |  | 0 |  | 0 |  | 0 |
Foreign exchange options |  |  |  |  |  |  | 239 |  | 361 |  | 0 |  | 0 |  | 239 |  | 361 |  | 0 |  | 0 |
Total |  |  |  |  |  |  | 83,796 |  | 103,110 |  | 83,557 |  | 102,749 |  | 239 |  | 361 |  | 0 |  | 0 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent warrant liabilities |  |  |  |  |  |  | 47,342 |  | 69,869 |  | 0 |  | 0 |  | 0 |  | 0 |  | 47,342 |  | 69,869 |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility (in hundredths) |  |  | 74.20% | 66.10% | 88.40% | 86.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate (in hundredths) |  |  | 0.10% | 0.10% | 0.90% | 0.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term |  |  | 0 years 8 months 12 days | 0 years 10 months 24 days | 2 years 10 months 24 days | 3 years 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | 69,869 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of contingent warrant liability to equity upon exercise of warrants | (2,525) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase in fair value of contingent warrant liabilities upon revaluation | (20,002) | 12,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, end of period | $ 47,342 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Included in cash and cash equivalents

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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes money market funds included in cash and cash equivalents. + References No definition available. + Details
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