Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

Stock-Based Compensation (Tables)

6 Months Ended

Sep. 30, 2012

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 September 30,				Six Months Ended September 30,
	2012		2011		2012		2011
Cost of goods sold	$	27	$	38	$	53	$	76
Research and development	73		90		148		171
Selling, general and administrative	258		314		495		615
Stock-based compensation expense	$	358	$	442	$	696	$	862

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

	Three Months Ended September 30,				Six Months Ended September 30,
	2012		2011		2012		2011
Risk-free interest rates	0.8	%	0.9	%	0.8	%	1.9	%
Expected lives (in years)	5.7		5.0		5.7		5.0
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	79.8	%	87.4	%	79.8	%	89.0	%

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, 2012	10,039,651		$	1.41
Granted	1,958,330		1.01
Exercised	—		—
Forfeited, cancelled or expired	(134,996	)	2.11
Options outstanding at September 30, 2012	11,862,985		$	1.34	6.05	$	434,577

Options fully vested at September 30, 2012 and those expected to vest beyond September 30, 2012	11,569,646		$	1.35	5.96	$	434,518

Options exercisable at September 30, 2012	8,722,942		$	1.41	4.93	$	407,145

Summary of restricted stock unit activity

	Shares		Weighted Average Grant-Date Fair Value
Unvested restricted stock units outstanding at March 31, 2012	1,143,262		$	1.20

Granted	832,794		1.01
Vested and issued	(269,013	)	1.32
Forfeited	(97,055	)	1.04

Unvested restricted stock units outstanding at September 30, 2012	1,609,988		$	1.09
Restricted stock units expected to vest beyond September 30, 2012	1,467,888		$	1.09

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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