Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Financial Assets and Liabilities Carried At Fair Value on Recurring Basis (Details)

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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