Equity Award Plans - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 01, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Feb. 28, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of Common Stock		13,249,000		13,249,000		11,304,000
2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of Common Stock							4,500,000
Percentage of shares outstanding under Equity Award Plan				5.00%
Increase in common stock available for issuance	1,792,000
2013 Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of Common Stock		930,000		930,000		1,005,000	1,000,000
Percentage of shares outstanding under Equity Award Plan				1.00%
Increase in common stock available for issuance	358,000
Percentage of fair market value of common stock of lesser				85.00%
Number of shares reserved under Employee Stock Purchase Plan		700,000		700,000
Shares issued under 2013 ESPP		105,000	90,000	105,000	90,000
Employee Stock Plan 2006 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, vest period				10 years
Repurchase of common stock		25,000		25,000		85,000
Long-term liability		$ 275		$ 275		$ 826