Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Change in Level 3 (Details)

v3.19.1
Fair Value Measurements - Change in Level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Loss on revaluation of warrants issued in conjunction with 2015 financing $ (1,122) $ 732
Loss on modification of warrants 257 $ 0
Warrant Liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 585  
Loss on revaluation of warrants issued in conjunction with 2015 financing 1,122  
Loss on modification of warrants 257  
Loss on revaluation of contingent liability 0  
Ending Balance 1,964  
Contingent Success Fee Liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 34  
Loss on revaluation of warrants issued in conjunction with 2015 financing 0  
Loss on modification of warrants 0  
Loss on revaluation of contingent liability 1  
Ending Balance $ 35