Stockholders' Equity and Stock-Based Compensation - Summary of Stock-Based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	$ 2,662	$ 758	$ 4,897	$ 6,687
Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	937	743	2,136	1,273
Unvested Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation		$ 15		61
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	1,194		1,675
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	$ 531		$ 1,086
Employee Sale of Securities to Investors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation				$ 5,353