Stockholders' Equity - Additional Information (Detail) (USD $)	6 Months Ended				6 Months Ended				6 Months Ended
	Jun. 28, 2013	Jun. 30, 2013	Dec. 04, 2006	Jun. 30, 2013 Warrants [Member]	Jun. 30, 2013 Warrants [Member] Maximum [Member]	Jun. 30, 2013 Warrants [Member] Minimum [Member]	Jun. 30, 2013 Options granted [Member]	Jul. 13, 2012 Equity incentive plan [Member]	Jun. 30, 2013 Common stock [Member]	Jun. 28, 2013 Post-split basis [Member] Equity incentive plan [Member]	Jul. 13, 2012 Post-split basis [Member] Equity incentive plan [Member]	Jun. 28, 2013 Pre-split basis [Member] Equity incentive plan [Member]	Jul. 13, 2012 Pre-split basis [Member] Equity incentive plan [Member]	Jun. 30, 2013 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage before exercise			20.00%
Number of shares authorized for issuance								7,500,000		19,150,000	18,600,000	18,600,000	9,300,000
Forward stock split of common stock									2
Weighted-average grant-date fair value per share							$ 30.57
Warrants to purchase aggregate shares of common stock				45,808
Weighted-average exercise price of options, per share				3.46
Warrants expiration date					2017	2014
Unrecognized stock-based compensation expense		$ 77,200,000
Unrecognized stock-based compensation expense, weighted-average period for recognition (years)		2 years 9 months 18 days
Common stock authorized for issuance														3,000,000
Employees share purchase plan, fair market value of common stock at beginning of offering period	85.00%
Employees share purchase plan, fair market value of common stock at end of purchase period	85.00%
Eligible employee contributions	$ 25,000
Offering period	24 months