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)

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Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 3,872
Gain adjustment to fair value (7,611)
Ending balance 5,242
Series 1 | Warrant liability  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
March 2018 Public Offering 3,481
Series 2 | Warrant liability  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
March 2018 Public Offering $ 5,500