Stockholders' Equity - Additional Information (Detail) - USD ($)					12 Months Ended
	Oct. 24, 2016	Jun. 16, 2015	Jan. 28, 2014	Jun. 28, 2012	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Preferred stock, shares authorized					10,000,000	10,000,000
Preferred stock, par value					$ 0.0001	$ 0.0001
Preferred stock, shares designated					0	0
Preferred stock, shares issued					0	0
Preferred stock, shares outstanding					0	0
Proceeds from sale of common stock	$ 189,700,000		$ 117,200,000
Common stock, shares authorized					300,000,000	300,000,000
Maximum 401(k) per employee, percentage of annual salary					60.00%
Compensation expense in connection with 401(k) retirement plan					$ 1,100,000	$ 900,000	$ 900,000
Change in control severance payment period for executives					12 months
Change in control severance payment period for employees					6 months
Change in control cash severance payment for chief executive officer					24 months base salary plus annual target incentive pay
Employee Stock Purchase Plan [Member]
Class of Stock [Line Items]
Common stock, shares authorized					2,500,000
Percentage of purchase price of stock					85.00%
Maximum [Member]
Class of Stock [Line Items]
Matching 401(k) employer contribution, maximum amount					$ 3,000
2012 Performance Incentive Plan [Member]
Class of Stock [Line Items]
Additional new shares available for award grants		7,000,000		5,300,000
Share-based compensation plan's share limit reduction for every one restricted stock unit granted					1.5
2012 Performance Incentive Plan [Member] | Maximum [Member]
Class of Stock [Line Items]
Number of common stock shares available for stock options grants					19,936,433
Stock options term under equity incentive plans					8 years
2012 Performance Incentive Plan [Member] | Employee [Member]
Class of Stock [Line Items]
Service period for stock-based compensation award granted					3 years
2012 Performance Incentive Plan [Member] | Director [Member]
Class of Stock [Line Items]
Service period for stock-based compensation award granted					1 year
2012 Performance Incentive Plan [Member] | Stock Options [Member] | Employee [Member]
Class of Stock [Line Items]
Service period for stock-based compensation award granted					4 years
2012 Performance Incentive Plan [Member] | Stock Options [Member] | Director [Member]
Class of Stock [Line Items]
Service period for stock-based compensation award granted					1 year
2000 Non-Officer Equity Incentive Plan [Member]
Class of Stock [Line Items]
Stock options term under equity incentive plans					8 years
Common Shares [Member]
Class of Stock [Line Items]
Sale of common stock, Shares	14,950,000		9,775,000		14,950,000		9,775,000
Underwriting commissions and discounts	$ 12,100,000		$ 7,500,000
Legal, accounting fees, filing fees and other offering expenses	$ 400,000		$ 600,000
Common stock, shares reserved for issuance in equity compensation plans					24,772,837