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Property and Equipment, Net - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property Plant And Equipment [Abstract]        
Depreciation expense $ 24,000 $ 3,000 $ 55,000 $ 3,000