Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis (Details)

v3.20.1
Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Warrant liability  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 986
December 2019 Public Offering warrants 13,921
Gain (loss) adjustment to fair value 3,489
Ending balance 18,396
Derivative liability  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Bifurcated embedded conversion option associated with Notes 6,960
Gain (loss) adjustment to fair value (2,112)
Adjustment for April 2019 conversion of Notes (1,656)
Ending balance $ 3,192