Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Schedule of earnings per share reconciliation

The following is a reconciliation of the basic and diluted net income (loss) per share computation: 

	Year Ended December 31,
	2012 (Revised)			2011 (Restated)			2010 (Restated)
Net (loss) income for basic EPS	$	(14,059,539	)	$	29,099,579		$	(50,348,301	)
Change in fair value of warrants	—			(24,436,309		)	—
Net loss (income), adjusted for change in fair value of warrants for diluted EPS	$	(14,059,539	)	$	53,535,888		$	(50,348,301	)
Weighted-average shares: basic	51,639,622			50,929,491			45,151,774
Effect of potential common shares	—			3,132,159			—
Weighted-average shares: diluted	51,639,622			54,061,650			45,151,774
Earnings (loss) per share: basic	$	(0.27	)	$	0.57		$	(1.12	)
Earnings (loss) per share: diluted	$	(0.27	)	$	0.09		$	(1.12	)
Anti-dilutive employee share-based awards, excluded	—			504,668			—

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The Company incurred losses for the years ended December 31, 2012 and 2010 whereas for the year ended December 31, 2011, the Company had net income. For all periods presented, certain equity instruments are excluded from the calculation of diluted earnings (loss) per share as the effect of such shares is anti-dilutive. The weighted average number of equity instruments excluded consist of:

	Year Ended December 31,
	2012	2011	2010
Stock Options	2,865,861	504,668	4,649,361
Stock-Settled Stock Appreciation Rights	421,020	—	—
Restricted Stock Units	351,011	—	—
Warrants	2,263,538	—	8,052,933

Fair Value Measurements, Recurring and Nonrecurring

At December 31, 2012 and 2011, the fair value of such warrants was as follows:

	2012 (Revised)		2011 (Restated)
Common stock warrants, current	$	333,793	$	125,841
Common stock warrants, non-current	657,246		1,412,304
	$	991,039	$	1,538,145