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)

v3.19.1
Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Warrant liabilities  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 986
Loss adjustment to fair value 6,522
Ending balance 7,508
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 2,880
Ending balance $ 9,840