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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) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Warrant liability $ 520
Level 1 [Member]    
Warrant liability
Level 2 [Member]    
Warrant liability
Level 3 [Member]    
Warrant liability $ 520