Annual report pursuant to Section 13 and 15(d)

Accrued Expenses and Warrant Liability - Warrant Liability (Details)

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Accrued Expenses and Warrant Liability - Warrant Liability (Details) - Derivative Liabilities - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, December 31, 2017 $ 1,096 $ 0
Fair value of derivative liabilities at issuance   3,313
Change in the fair value of derivative liabilities 3,445 (2,217)
Reclassification to additional paid-in capital (4,541)  
Balance, December 31, 2018 $ 0 $ 1,096