Stockholders' Equity - Summary of Non-Vested Stock Options (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period	614,468
Nonvested, Shares, Granted	152,265
Nonvested, Shares, Vested	(224,932)
Nonvested, Shares, Forfeited
Nonvested at end of period	541,801
Weighted Average Grant Date Fair Value, Nonvested at September 30, 2014	$ 3.33
Nonvested at September 30, 2014, Aggregate Intrinsic Value	$ 6,276,843