Commitments and Contingencies - Additional Information (Details) $ in Millions		12 Months Ended
	May 31, 2016 ft²	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Total rent expense for operating leases | $		$ 3.8	$ 3.5	$ 2.8
Amended additional office space lease | ft²	9,000