Restructuring Charges - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		9 Months Ended
	Jan. 31, 2015 employee	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 15	$ (110)	$ 111	$ 1,101
Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | employee	40
Number of positions expected to be eliminated (percent)	7.00%
Restructuring charges						$ 4,200