Share-Based Payments - Additional Information (Detail) (USD $)	3 Months Ended				3 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 2009 Stock Incentive Plan [Member]	Dec. 31, 2013 2009 Stock Incentive Plan [Member]	Mar. 31, 2014 2009 Stock Incentive Plan [Member] Cliff for new employee [Member]	Dec. 31, 2013 Stock Incentive Plan 2014 [Member]	Mar. 31, 2014 Performance-Based Awards [Member]	Mar. 31, 2013 Performance-Based Awards [Member]	Mar. 31, 2014 Non-Employee Restricted Stock [Member]	Mar. 31, 2013 Non-Employee Restricted Stock [Member]	Mar. 31, 2014 Employees and Directors Stock Option [Member]	Mar. 31, 2013 Employees and Directors Stock Option [Member]	Mar. 31, 2013 Non-employee Stock Options [Member]	Mar. 31, 2014 Non-Employee Stock Option [Member]	Mar. 31, 2013 Non-Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair value exercise price grant date of ISOs granted to 10% shareholder employees			110.00%
Award vesting period			4 years		1 year
Award term			10 years
Stock incentive plan, reserved shares of common stock				1,347,821		708,661
Stock incentive plan, shares remained available for future issuance				1,586
Stock incentive plan, annual increase in reserved shares of common stock						1,102,362
Stock incentive plan, annual increase in reserved shares as percentage of outstanding common stock						4.00%
Total intrinsic value of options vested and expected to vest	$ 12,300,000
Total intrinsic value of options exercised	120,000	28,000
Total fair value of employee options vested	186,000	3,000
Restricted stock, granted									0	0
Unvested stock, granted									0
Expense related to the restricted stock granted to non-employees							17,000	0	48,000	19,000	289,000	15,000
Unrecognized compensation expense							3,500,000
Option granted, weighted average exercise prices	$ 16.85												$ 0.83
Stock options granted	80,715												173,228
Expense related to the options granted to employees														300,000	6,000
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock	$ 4,500,000
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock, recognition period	2 years 9 months 11 days