Net Income (Loss) Per Share - Schedule of Basic and Diluted Net Loss Per Share (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Denominator:
Weighted average common shares outstanding (in shares)	49,144	50,020
Less: Unvested common shares subject to repurchase (in shares)	(5)	(22)
Total common shares-basic (in shares)	49,139	49,998
Effect of dilutive securities:
Stock awards (in shares)	0	207
Restricted stock awards and units (in shares)	0	361
Total common shares-diluted (in shares)	49,139	50,566