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 ($)
Sep. 30, 2016
Dec. 31, 2015
Assets [Abstract]    
Marketable securities $ 0 $ 500,000
Liabilities [Abstract]    
Contingent warrant liabilities 9,000 10,464,000 [1]
Recurring [Member]    
Assets [Abstract]    
Marketable securities   496,000
Total   43,086,000
Liabilities [Abstract]    
Contingent warrant liabilities 9,000 10,464,000
Recurring [Member] | Money Market Funds [Member]    
Assets [Abstract]    
Money market funds [2] 16,455,000 42,590,000
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets [Abstract]    
Marketable securities   496,000
Total   43,086,000
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]    
Assets [Abstract]    
Money market funds [2] 16,455,000 42,590,000
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Liabilities [Abstract]    
Contingent warrant liabilities $ 9,000 $ 10,464,000
[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