Stockholder's Equity - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended			1 Months Ended	12 Months Ended						0 Months Ended		1 Months Ended
	Oct. 31, 2012	Jun. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2011 Common Stock [Member]	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Oct. 31, 2012 Common Stock [Member]	Oct. 31, 2012 Warrant [Member]	Jun. 30, 2011 Warrant [Member]	Jun. 30, 2011 Placement Agent And Financial Advisor [Member]	Jan. 16, 2014 Subsequent Event [Member]	Jan. 31, 2014 Subsequent Event [Member]	Jun. 30, 2011 Unit Consisting of I [Member]	Jun. 30, 2011 Unit Consisting of II [Member]	Jun. 30, 2011 Unit Consisting of III [Member]	Oct. 31, 2012 From [Member]	Oct. 31, 2012 To [Member]	Jan. 31, 2014 Maximum [Member] Subsequent Event [Member]	Jan. 16, 2014 Maximum [Member] Subsequent Event [Member]	Jan. 31, 2014 Minimum [Member] Subsequent Event [Member]	Jan. 16, 2014 Minimum [Member] Subsequent Event [Member]	Oct. 31, 2012 Per Whole Share [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units in public offering	7,500,000
Unit price	$ 2.00	$ 4.00
Number of common stock share of each unit	1														1
Class of warrant or right, number of securities called by each warrant or right									0.5							0.25	0.25
Common stock, par value	$ 0.005		$ 0.005	$ 0.005
Warrants issued during the period, price per warrant																4.50	5.00	4.00	2.00	1.60	1.60	1.22	1.22	3.00
Underwriters option, days to exercise	30 days
Class of warrant or right, number of securities called by warrants or rights									1,125,000	562,500	2,936,250	176,175
Over-allotment price per share									$ 1.995
Over-allotment price per warrant to purchase a whole share										0.0094
Warrants issued to underwriter	562,500
Stock issue during period, shares new issues	1,025,000					5,872,500	8,525,000	5,872,500
Warrants not settleable in cash, fair value disclosure		$ 2,525,175		$ 4,521,681
Proceeds from issuance of common stock		23,500,000		15,675,727	21,946,801								6,400,000
Number of Warrants			10,534,245											156,250
Share-based compensation arrangement by share-based payment award, options, grants in period, net of forfeitures			903,775	1,132,383	1,459,393
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value			$ 1.21	$ 1.32	$ 4.04
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value			887,603	1,549,888	5,381,855
Share-based compensation arrangement by share-based payment award, options, exercises in period, total intrinsic value			5,736	1,485	818,723
Employee Service Share-based Compensation, non-vested awards, total compensation cost not yet recognized			$ 445,647
Employee Service Share-based Compensation, non-vested awards, total compensation cost not yet recognized, period for recognition			9 months 4 days