Convertible Preferred Stock and Stockholders' Equity (Deficit) - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 22, 2013
Class Of Stock [Line Items]
Convertible preferred stock, shares outstanding	0	24,026,797
Cash dividend annual rate	8.00%
Warrants to purchase share of common stock were outstanding at exercise price		81,075		81,075
Term of stock options granted	10 years
Vesting period of stock options	4 years
Common stock reserved, shares	81,948
Number of common stock shares reserved for issuance under the 2013 Employee Stock Purchase Plan	4,903,323
Aggregate intrinsic value of options exercised	$ 6,300,000	$ 451,000	$ 290,000
Total estimated grant date fair value of options vested	$ 3,800,000	$ 3,000,000	$ 1,800,000
Preferred stock, shares authorized	5,000,000	0
Incentive Stock Options
Class Of Stock [Line Items]
Exercise price of stock options granted as a minimum percentage of fair value of common stock	100.00%
Nonstatutory Stock Options
Class Of Stock [Line Items]
Exercise price of stock options granted as a minimum percentage of fair value of common stock	85.00%
10% or more
Class Of Stock [Line Items]
Exercise price of stock options granted as a minimum percentage of fair value of common stock	110.00%
Percentage of voting stock	10.00%
Warrant
Class Of Stock [Line Items]
Warrants to purchase share of common stock were outstanding at exercise price	82,575
Minimum | Warrant
Class Of Stock [Line Items]
Exercise Price Per Share	10.00
Maximum | Warrant
Class Of Stock [Line Items]
Exercise Price Per Share	13.10
Series D Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock, shares outstanding		6,287,026
Number of votes per common stock the preferred stock converts into	1
Original issue price of stock	$ 14.15
Series D Preferred Stock | Minimum
Class Of Stock [Line Items]
Percentage of outstanding convertible preferred stock	50.00%
Series 1 Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock, shares outstanding		636,042
Number of votes per common stock the preferred stock converts into	0
Original issue price of stock	$ 14.15
Series A Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock, shares outstanding		4,309,972
Number of votes per common stock the preferred stock converts into	1
Original issue price of stock	$ 10.00
Warrants to purchase share of common stock were outstanding at exercise price		4,740		4,740
Exercise Price Per Share	10.00
Series B Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock, shares outstanding		3,579,597
Number of votes per common stock the preferred stock converts into	1
Original issue price of stock	$ 13.10
Warrants to purchase share of common stock were outstanding at exercise price		76,335		76,335
Exercise Price Per Share	13.10
Series C Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock, shares outstanding		9,214,160
Number of votes per common stock the preferred stock converts into	1
Original issue price of stock	$ 14.15