Net Loss per Common Share (Tables)

3 Months Ended

Mar. 31, 2015

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the computation of basic and diluted net income (loss) per share for the periods indicated:

	Three Months Ended
	March 31,
	2015		2014
Basic and diluted net loss per common share calculation:
Net loss and comprehensive loss	$	(14,493,000)	$	(11,307,000)
Accretion of redeemable convertible preferred stock	(338,000)		(314,000)
Net loss attributable to common stockholders	$	(14,831,000)	$	(11,621,000)
Weighted average common shares outstanding	212,290,406		182,535,562
Net loss per share of common stock—basic and diluted	$	(0.07)	$	(0.06)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following outstanding securities at March 31, 2015 and 2014 have been excluded from the computation of diluted weighted shares outstanding, as they would have been anti-dilutive:

	March 31,		March 31,
	2015		2014
Options		2,127,310		1,235,172
Warrants		10,655,502		30,857,698
Series B redeemable convertible preferred stock		86,710,400		88,599,780
Escrow		—		12,000,000
Total		99,493,212		132,692,650