Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

Stock-Based Compensation (Tables)

3 Months Ended

Jun. 30, 2014

Stock-Based Compensation

Summary of stock-based compensation expense by statement of operations line item

The following table summarizes, by statement of operations line item, stock-based compensation expense (in thousands):

		Three Months Ended June 30, 2014			Three Months Ended June 30, 2013
Cost of goods sold		$	21		$	13
Research and development		77			354
Selling, general and administrative		589			367
Stock-based compensation expense		$	687		$	734

Summary of stock option activity

		Shares		Weighted Average Exercise Price			Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Options outstanding at March 31, 2014		12,851,688		$	1.27
Granted		1,085,800		1.43
Exercised		—		—
Forfeited, cancelled or expired		(60,088	)	2.43
Options outstanding at June 30, 2014		13,877,400		$	1.28		5.4		$	4,902,918

Options fully vested at June 30, 2014 and those expected to vest beyond June 30, 2014		13,612,749		$	1.28		5.3		$	4,825,312

Options exercisable at June 30, 2014		10,411,613		$	1.32		4.2		$	3,622,299

Schedule of weighted-average assumptions used to calculate the estimated fair value of each stock option

		Three Months Ended June 30, 2014			Three Months Ended June 30, 2013
Risk-free interest rates		1.8		%	0.9		%
Expected lives (in years)		5.7			5.7
Dividend yield		—		%	—		%
Expected volatility		77.0		%	77.3		%
Weighted average grant date fair value of options granted during the period		$	0.94		$	0.60

Summary of restricted stock unit activity

		Shares		Weighted Average Grant-Date Fair Value
Nonvested restricted stock units outstanding at March 31, 2014		2,061,224		$	1.11

Granted		571,000		1.49
Vested and issued		(361,685	)	1.11
Forfeited		(28,608	)	1.18

Nonvested restricted stock units outstanding at June 30, 2014		2,241,931		$	1.17
Restricted stock units expected to vest beyond June 30, 2014		2,028,197		$	1.17