Capitalized Software Development Costs - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Capitalized Computer Software Net [Abstract]
Capitalized software development costs	$ 1.3		$ 4.3		$ 4.9
Capitalized software development costs, amortization expense	$ 1.3	$ 1.0	$ 3.6	$ 2.1