Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Fair Value Measurements - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Assets [Abstract]    
Marketable securities $ 0 $ 500,000
Liabilities [Abstract]    
Contingent warrant liabilities   10,464,000
Recurring [Member]    
Assets [Abstract]    
Marketable securities   496,000
Total   43,086,000
Liabilities [Abstract]    
Contingent warrant liabilities   10,464,000
Recurring [Member] | Money Market Funds [Member]    
Assets [Abstract]    
Money market funds [1] 4,161,000 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 [1] $ 4,161,000 42,590,000
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Liabilities [Abstract]    
Contingent warrant liabilities   $ 10,464,000
[1] Included in cash and cash equivalents