Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended						3 Months Ended	9 Months Ended		1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Sep. 30, 2013 OfferingPeriods	Sep. 30, 2012	Sep. 30, 2013 Restricted Stock Units [Member]	Sep. 30, 2013 Restricted Stock Award [Member]	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Employee Stock Purchase Plan [Member]	Sep. 30, 2013 Employee Stock Purchase Plan [Member]	Jun. 30, 2013 Employee Stock Purchase Plan [Member]	Jan. 31, 2013 Equity Incentive Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares were authorized under 2010 Equity Incentive Plan													888,765
Shares available for grant	1,800,000			1,800,000
Stock-based compensation expense	$ 1,085,000	$ 715,000		$ 3,120,000	$ 2,042,000					$ 116,000	$ 299,000
Unrecognized stock-based compensation expense	8,200,000			8,200,000
Unrecognized stock-based compensation, expected to be recognized, weighted average period				2 years 8 months 12 days
Stock options contractual term Range								10 years	7 years
Stock options vest, period				4 years
Stock options contractual term, from the date of grant				Seven to ten years
Stock options exercisable	640,625			640,625
Weighted average exercise price	$ 12.27			$ 12.27
Weighted average remaining contractual life				6 years 1 month 6 days
Weighted average fair value per share of options granted				$ 14.53
Restricted stock units vest over, period						4 years
Restricted stock awards units vest over, period							1 year
Number of RSU's vested and not issued during the period						7,142
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	$ 337,000		$ 551,000	$ 337,000
Common stock available for future purchases												1,200,000
Employee stock purchase plan, shares purchased			17,386