Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Fair Value Hierarchies (Details)

v3.19.2
Fair Value Measurements - Fair Value Hierarchies (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Liabilities    
Warrant liabilities $ 6,561 $ 585
Contingent success fee liability 35  
Recurring    
Liabilities    
Warrant liabilities 6,561 585
Contingent success fee liability 35 34
Level 1 | Recurring    
Liabilities    
Warrant liabilities 0 0
Contingent success fee liability 0 0
Level 2 | Recurring    
Liabilities    
Warrant liabilities 0 0
Contingent success fee liability 0 0
Level 3 | Recurring    
Liabilities    
Warrant liabilities 6,561 585
Contingent success fee liability $ 35 $ 34