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Fair Value of Financial Assets and Liabilities - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Apr. 26, 2017
Warrant liability $ 1,577 $ 520
Fair Value, Measurements, Recurring [Member]      
Warrant liability 1,577 520  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]      
Warrant liability  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]      
Warrant liability  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Warrant liability $ 1,577 $ 520