Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements Rollforward (Details)

v3.19.1
Fair Value Measurements Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Change in fair value $ 368 $ 74 $ 137
Fair value, measurements, recurring      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Ending balance 2,798    
Fair value, inputs, level 3 | Fair value, measurements, recurring      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Additions to warrant liability 2,347    
Change in fair value 368    
Ending balance $ 2,798