Accounting for Stock-Based Compensation - Additional Information (Detail) (USD $)	0 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 02, 2014	Feb. 18, 2014	Feb. 28, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Plans	Jun. 30, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Share-based compensation, number of plans						2
Share based compensation arrangement vesting period						60 days
Options issued						1,040,000
Aggregate intrinsic value of employee options outstanding				$ 1,906,000		$ 1,906,000
Intrinsic value of exercisable options				1,837,000		1,837,000
Weighted average grant-date fair values of stock options	$ 0.34	$ 1.20				$ 1.82	$ 2.14
Unrecognized compensation cost, net of estimated forfeitures				6,192,000		6,192,000
Intrinsic values of employee stock options exercised						105,000	1,598,000
Fair values of vested stock options						1,376,000	1,808,000
Stock options granted	400,000	640,000	640,000			400,000
Stock option granted, per share			$ 3.09			$ 1.75
Compensation expense related to employee and director stock option grants				108,366		156,377
Non-employee compensation expense				110,434	164,269	54,762	180,510
Stock options outstanding [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Compensation expense related to employee and director stock option grants				794,255	751,702	1,482,027	1,396,027
Tranche [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Aggregate expense						$ 905,000
2010 Plan [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Options granted						1,987,500
Share based compensation arrangement vesting period						4 years
Options granted with four year vesting period						947,500
2010 Plan [Member] | Non-Employee Directors [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Options granted to employee directors with one year vesting period						235,000
Share based compensation, vesting period of options						1 year
Unrecognized compensation cost, weighted average period for recognition, years						2 years 9 months 18 days