Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Warrant liabilities  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 986
Loss adjustment to fair value 4,473
Ending balance 5,459
Derivative liability  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Beginning balance 0
Bifurcated embedded conversion option associated with Notes 6,960
Loss adjustment to fair value 1,556
Adjustment for April 2019 conversion of Notes (1,656)
Ending balance $ 6,860