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Fair Value Measurements - Financial Assets and Liabilities Carried At Fair Value on Recurring Basis (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Assets [Abstract] |  |  |
Marketable securities |  | $ 500,000 | $ 0
Liabilities [Abstract] |  |  |
Contingent warrant liabilities |  | 10,464,000 | 31,828,000
Recurring [Member] |  |  |
Assets [Abstract] |  |  |
Foreign exchange options | [1] |  | 6,000
Marketable securities |  | 496,000 |
Total |  | 43,086,000 | 67,575,000
Liabilities [Abstract] |  |  |
Contingent warrant liabilities |  | 10,464,000 | 31,828,000
Recurring [Member] | Money Market Funds [Member] |  |  |
Assets [Abstract] |  |  |
Money market funds | [2] | 42,590,000 | 67,569,000
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets [Abstract] |  |  |
Marketable securities |  | 496,000 |
Total |  | 43,086,000 | 67,569,000
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member] |  |  |
Assets [Abstract] |  |  |
Money market funds | [2] | 42,590,000 | 67,569,000
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets [Abstract] |  |  |
Foreign exchange options | [1] |  | 6,000
Total |  |  | 6,000
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Liabilities [Abstract] |  |  |
Contingent warrant liabilities |  | $ 10,464,000 | $ 31,828,000
[1] | Included in other assets
[2] | Included in cash and cash equivalents

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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