Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2012

Shareholders' Equity [Abstract]

Summary of stock options activity

	Options			Weighted Average Exercise Price		Weighted Average Contractual Term		Aggregate Intrinsic Value
Outstanding December 31, 2011		10,774,078		$	1.07
Granted		477,500			3.08
Exercised		(689,000	)		1.02
Forfeited or expired		(200,000	)		2.25
Outstanding September 30, 2012		10,362,578		$	1.15		4.3	$	17,388,999
Vested or expected to vest at September 30, 2012		9,592,648		$	1.03		4.0	$	17,102,249

Summary of carrying value of warrant liability

	September 30, 2012			September 30, 2011
Beginning Balance, January 1	$	2,157,408		$	2,581,871
Issuance of warrants and effect of repricing		368,524			2,476,790
Exercise of warrants		(1,944,688	)		—
(Gain) or loss included in earnings		5,018,224			(1,517,583	)
Transfers in and/or out of Level 3		—			—
Ending Balance, September 30	$	5,599,468		$	3,541,078