Quarterly report pursuant to Section 13 or 15(d)

Warrant Liabilities - Fair value of warrant liabilities by Level 3 inputs (Details)

v3.20.2
Warrant Liabilities - Fair value of warrant liabilities by Level 3 inputs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 03, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Warrants to purchase shares of common stock 31,144,386   31,144,386    
Fair value of warrant liabilities by Level 3 inputs          
Beginning balance     $ 320    
Issuance of the January 2020 Warrants     1,654    
Change in fair value $ 0 $ 0 923 $ 0  
Reclassification of warrants to additional paid-in capital     (2,897)    
Ending balance $ 0   $ 0    
Warrant          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Warrants to purchase shares of common stock         11,552,314