Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Fair Value of Liabilities Measured on Recurring Basis (Details)

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Fair Value Measurements - Fair Value of Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities related to Warrants $ 9,767 $ 17,582
Derivative instrument liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities related to Warrants 9,767 17,582
Fair value on a recurring basis | Warrants | Derivative instrument liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities related to Warrants 9,767 17,582
Fair value on a recurring basis | Warrants | Derivative instrument liability | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities related to Warrants 0 0
Fair value on a recurring basis | Warrants | Derivative instrument liability | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities related to Warrants 0 0
Fair value on a recurring basis | Warrants | Derivative instrument liability | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities related to Warrants $ 9,767 $ 17,582