Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commitments And Contingencies Disclosure [Abstract]
Future minimum sublease income	$ 0.2		$ 0.2
Rent expense	$ 0.4	$ 0.5	$ 1.2	$ 1.3