Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Segment	Sep. 30, 2011	Dec. 31, 2011
Significant Accounting Policies [Line Items]
Number of operating segment			1
Net Realized Gains (Losses)	$ 1,227,656		$ 1,227,656
Deferred revenue	46,000		46,000		500,000
Cost reimbursed to offset research and development expenses	100,000	100,000	1,100,000	400,000
Share-based compensation forfeitures rate	12.00%	12.00%
Stock options granted	0	256,639	200,948	560,639
Restricted stock granted	0	50,000	0	50,000
Unrecognized share-based compensation expense related to unvested awards	2,500,000		2,500,000
Provision for income taxes	$ 22,072		$ 188,610
Anti-dilutive securities excluded from computation of earnings per share	11,500,000			10,900,000
Maximum
Significant Accounting Policies [Line Items]
Unrecognized share-based compensation expense related to unvested awards expected to be recognized in the period	1 year 11 months 9 days
Liquidity | Maximum
Significant Accounting Policies [Line Items]
Cash liquidity maturity period			3 months