Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted net (loss) income per share of common stock

The following table sets forth the computation of basic and diluted net loss per share of common stock attributable to common stockholders:

	Three Months Ended
	March 31,
	2015			2014
	(in thousands, except per-share data)
Net Loss	$	(10,593	)	$	(2,906	)
Weighted average common shares outstanding — Basic	42,039			33,715
Plus incremental shares from assumed conversions:
Dilutive effect of stock options	—			—
Weighted average common shares outstanding — Diluted	42,039			33,715
Net loss per share:
Basic	$	(0.25	)	$	(0.09	)
Diluted	$	(0.25	)	$	(0.09	)

Schedule of antidilutive securities excluded from computation of diluted net income per share of common stock

	Three Months Ended
	March 31,
	2015	2014
	(in thousands)
Stock options	6,615	5,664
Warrants	31	51
Unvested restricted stock awards	6	4
Total	6,652	5,719