Stockholders' Equity - Summary of Non-Vested Stock Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares [Roll Forward]
Nonvested at Beginning of period	854,640
Granted	278,794
Vested	(342,538)
Forfeited	(176,428)
Nonvested at End of period	614,468
Weighted Average Grant Date Fair Value, Nonvested at December 31, 2013	$ 2.59
Nonvested at December 31, 2013, Aggregate Intrinsic Value	$ 1,386,415