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Fair Value Measurements - Financial Assets and Liabilities Carried At Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets [Abstract] |  |  |  |
Marketable securities |  | $ 500 | $ 500 |
Liabilities [Abstract] |  |  |  |
Contingent warrant liabilities |  | 3,532 | 10,464 | [1]
Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Marketable securities |  | 454 | 496 |
Total |  | 43,564 | 43,086 |
Liabilities [Abstract] |  |  |  |
Contingent warrant liabilities |  | 3,532 | 10,464 |
Recurring [Member] | Money Market Funds [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Money market funds | [2] | 43,110 | 42,590 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Marketable securities |  | 454 | 496 |
Total |  | 43,564 | 43,086 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Money market funds | [2] | 43,110 | 42,590 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Liabilities [Abstract] |  |  |  |
Contingent warrant liabilities |  | $ 3,532 | $ 10,464 |
[1] | The condensed consolidated balance sheet as of December 31, 2015 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.
[2] | Included in cash and cash equivalents

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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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