Equity Compensation Plans - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	$ 10,614	$ 25,604	$ 23,687
Cost of Revenue
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	2,428	3,068	1,105
Sales and Marketing
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	2,980	10,737	860
General and Administrative
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	5,716	11,310	$ 21,722
Research and Development
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	$ (510)	$ 489