Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended			12 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012 Employee Stock Option Minimum	Dec. 31, 2012 Employee Stock Option Maximum	Dec. 31, 2012 Non-Employee Directors and Consultants	Jun. 30, 2014 Unvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 545,212	$ 312,691	$ 852,637	$ 562,762
Incentive options, vesting period						4 years	5 years	1 year	5 years
Incentive options, vesting on the first anniversary of the date of grant						20.00%	25.00%
Incentive options, term							10 years
Stock options, outstanding	1,312,741	1,795,588	1,312,741	1,795,588	1,610,988
Number of shares available for future grant	2,818,751		2,818,751
Closing price of common stock	$ 22.79		$ 22.79
Weighted average grant date fair value of share-based awards granted			$ 10.85	$ 3.84
Total fair value of stock options vested			646,322	695,795
Total unrecognized compensation cost	$ 4,328,098		$ 4,328,098
Unrecognized compensation cost, weighted average remaining requisite service period			3 years 1 month 28 days
Number of unvested options	791,538		791,538