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Property and Equipment and Capitalized Software - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property Plant And Equipment [Line Items]          
Depreciation and amortization expense $ 0.2 $ 0.1 $ 0.7 $ 0.5  
Other Assets [Member]          
Property Plant And Equipment [Line Items]          
Capitalized software cost, net $ 0.7   $ 0.7   $ 0.4