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Fair Value of Financial Assets and Liability - Financial Liabilities (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Assumption used to estimate the fair value of asset and liability by utilizing the Black-Scholes option pricing model    
Expected dividend yield (as a percent) 0.00%  
2017 Series A Investor Instrument    
Roll forward of the fair value of financial liabilities    
Fair value upon initial closing, net   $ 328
Change in fair value through the date of settlement   1,863
Reclassification of liability upon August 2017 Second Tranche Closing   $ (2,191)
Assumption used to estimate the fair value of asset and liability by utilizing the Black-Scholes option pricing model    
Exercise Price   $ 1.00
Fair Value   $ 1.33
Expected term   1 month 15 days
Expected volatility (as a percent)   64.00%
Expected interest rate (as a percent)   0.95%