Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

Stock-Based Compensation (Tables)

6 Months Ended

Sep. 30, 2013

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,
	2013		2012		2013		2012
Cost of goods sold	$	8	$	27	$	21	$	53
Research and development	63		73		416		148
Selling, general and administrative	379		258		747		495
Stock-based compensation expense	$	450	$	358	$	1,184	$	696

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	—		—
Forfeited, cancelled or expired	(100,848	)	1.10
Options outstanding at September 30, 2013	13,356,117		$	1.29	5.62	$	1,744,683

Options fully vested at September 30, 2013 and those expected to vest beyond September 30, 2013	13,074,488		$	1.29	5.54	$	1,686,707

Options exercisable at September 30, 2013	9,877,196		$	1.37	4.44	$	1,118,477

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,
	2013		2012		2013		2012
Risk-free interest rates	1.9	%	0.8	%	0.9	%	0.8	%
Expected lives (in years)	5.7		5.7		5.7		5.7
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	76.0	%	79.8	%	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	1,245,918		1.06
Vested and issued	(625,485	)	1.06
Forfeited	(64,447	)	1.09

Unvested restricted stock units outstanding at September 30, 2013	2,023,082		$	1.10
Restricted stock units expected to vest beyond September 30, 2013	1,810,177		$	1.10

- 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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