Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 OfferingPeriods	Jun. 30, 2013	Jan. 31, 2014 Equity Incentive Plan 2010 [Member]	Jun. 30, 2014 Employee Stock Purchase Plan [Member]	Jun. 30, 2014 Employee Stock Purchase Plan [Member]	Jun. 30, 2014 Restricted Stock Units [Member]	Jun. 30, 2014 Restricted Stock Award [Member]	Jun. 30, 2014 Maximum [Member]	Jun. 30, 2014 Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares were authorized under 2010 Equity Incentive Plan					965,527
Shares available for grant	2,600,000		2,600,000
Stock-based compensation expense	$ 1,359,000	$ 1,111,000	$ 2,698,000	$ 2,035,000		$ 95,000	$ 201,000
Unrecognized stock-based compensation expense	10,900,000		10,900,000
Unrecognized stock-based compensation, expected to be recognized, weighted average period			2 years 9 months 18 days
Stock options contractual term Range										10 years	7 years
Stock options vest, period			4 years					4 years
Stock options contractual term, from the date of grant			Seven to ten years
Stock options exercisable	717,306		717,306
Weighted average exercise price	$ 16.66		$ 16.66
Weighted average remaining contractual life			5 years 8 months 12 days
Weighted average fair value per share of options granted			$ 24.69
Restricted stock awards units vest over, period									1 year
Number of RSU's vested and not issued during the period			12,063
Percentage of common stock on fair market value			85.00%
Number of offerings per year			2
Common stock reserved for future issuance						1,200,000	1,200,000
Employee stock purchase plan, employees contribution	680,000		680,000
Employee stock purchase plan, shares purchased			12,520
Net proceeds from employee stock purchase plan			$ 672,000	$ 551,000