Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Significant Accounting Policies

Schedule of Property Plant and Equipment Useful Lives

Buildings	20 years
Building improvements	5 - 20 years
Software, machinery and equipment	1 - 15 years

Schedule of components of the calculations of basic and diluted earnings per share:

	Year Ended December 31,
	2014			2013			2012
Numerator:
Net loss attributable to common shareholders	$	(88,643,700	)	$	(62,790,800	)	$	(31,862,454	)
Denominator:
Weighted average number of common shares outstanding		159,228,815			76,436,408			34,376,427

Schedule of dilutive potential common shares

	At December 31,
	2014		2013		2012
Stock options outstanding		8,367,271		4,703,326		1,986,255
Restricted stock outstanding		473,336		650,002		—
Common stock warrants(1)		4,219,442		24,137,878		9,421,008
Preferred stock(2)		5,554,594		10,972,859		—
Number of dilutive potential common shares		18,614,643		40,464,065		11,407,263

(1)

In May 2011, the Company issued 7,128,563 warrants as part of an underwritten public offering. As a result of additional public offerings, and pursuant to the effect of the anti-dilution provisions of these warrants, the number of warrants increased to 22,995,365. Of the warrants issued in May 2011, 22,776,023 have been exercised as of December 31, 2014. In February 2013, the Company issued 23,637,500 warrants as part of an underwritten public offering. Of the warrants issued in February 2013, 23,637,400 were exercised as of December 31, 2014. In January 2014, the Company issued 4,000,000 warrants as part of an underwritten public offering. Of the warrants issued in January 2014, none have been exercised as of December 31, 2014. As of December 31, 2014, the remaining 4,219,442 warrants have a weighted average exercise price of $3.84.

(2)

The preferred stock amount represents the dilutive potential common shares of the Series C redeemable convertible preferred stock issued on May 16, 2013 based on the conversion price of the preferred stock as of December 31, 2014. Of the 10,431 preferred shares issued in May 2013, 5,200 had been converted to common stock as of December 31, 2014.