Stockholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Apr. 06, 2007	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stockholders Equity Note Disclosure [Line Items]
Common stock, shares reserved				4,005,174
Common stock, shares purchased through issuance of warrants	150,000
Common stock, shares purchased through issuance of warrants per share	$ 0.01
Warrant term	7 years
Stock-based compensation expense		$ 3,598,000	$ 1,766,000	$ 1,060,000
Stock options, outstanding		1,240,935	1,225,117	1,610,988
Number of shares available for future grant		2,441,761
Closing price of common stock		$ 28.29
Aggregate intrinsic value of stock options exercised		$ 4,942,000	$ 10,475,000	$ 3,723,000
Weighted average grant date fair value of share-based awards granted		$ 22.45	$ 11.12	$ 4.31
Total fair value of stock options vested		$ 2,317,000	$ 1,084,000	$ 991,000
Total unrecognized compensation cost		$ 6,547,000
Unrecognized compensation cost, weighted average remaining requisite service period		3 years 29 days
Number of unvested options		623,652
Employee Stock Option | Former president and chief executive officer
Stockholders Equity Note Disclosure [Line Items]
Stock-based compensation expense		$ 826,000
Employee Stock Option | Former president and chief executive officer | Vested as of January 2015
Stockholders Equity Note Disclosure [Line Items]
Incentive options, vesting percentage		50.00%
Employee Stock Option | Minimum
Stockholders Equity Note Disclosure [Line Items]
Incentive options, vesting period					3 years
Employee Stock Option | Minimum | Vest Over Three Year
Stockholders Equity Note Disclosure [Line Items]
Incentive options, vesting percentage					20.00%
Employee Stock Option | Maximum
Stockholders Equity Note Disclosure [Line Items]
Incentive options, vesting period					5 years
Incentive options, term					10 years
Employee Stock Option | Maximum | Vest Over Five Year
Stockholders Equity Note Disclosure [Line Items]
Incentive options, vesting percentage					33.00%
Non-Employee Directors
Stockholders Equity Note Disclosure [Line Items]
Incentive options, vesting period					1 year
Unvested Options
Stockholders Equity Note Disclosure [Line Items]
Incentive options, vesting period		5 years