Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2013

Stock-Based Compensation

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

The following table summarizes stock-based compensation expense as it is associated with each of the operations line items listed below (in thousands):

		Three Months Ended December 31,						Nine Months Ended December 31,
		2013			2012			2013			2012
Cost of goods sold		$	13		$	23		$	34		$	76
Research and development		73			91			490			240
Selling, general and administrative		395			367			1,140			861
Stock-based compensation expense		$	481		$	481		$	1,664		$	1,177

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, 2013		11,791,765		$	1.33
Granted		1,665,200		0.93
Exercised		(13,022	)	1.01
Forfeited, cancelled or expired		(107,830	)	1.15
Options outstanding at December 31, 2013		13,336,113		$	1.29		5.37		$	2,695,890

Options fully vested at December 31, 2013 and those expected to vest beyond December 31, 2013		13,103,969		$	1.29		5.31		$	2,620,410

Options exercisable at December 31, 2013		10,059,889		$	1.36		4.27		$	1,737,651

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

		Three Months Ended December 31,				Nine Months Ended December 31,
		2013		2012		2013		2012
Risk-free interest rates		—	%	—	%	0.9	%	0.8	%
Expected lives (in years)		—		—		5.7		5.7
Dividend yield		—	%	—	%	—	%	—	%
Expected volatility		—	%	—	%	77.3	%	79.8	%

Summary of restricted stock unit activity

		Shares		Weighted Average Grant-Date Fair Value
Unvested restricted stock units outstanding at March 31, 2013		1,467,096		$	1.10

Granted		1,295,418		1.06
Vested and issued		(651,908	)	1.06
Forfeited		(85,171	)	1.09

Unvested restricted stock units outstanding at December 31, 2013		2,025,435		$	1.09
Restricted stock units expected to vest beyond December 31, 2013		1,836,615		$	1.09