Property and Equipment, Net - Additional Information (Details) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2017 ft²	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)
Property, Plant and Equipment [Abstract]
Rentable area (in sq ft) | ft²	106,230
Depreciation and amortization, property, plant and equipment | $		$ 2.8	$ 2.9