Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

Stock-Based Compensation (Tables)

3 Months Ended

Jun. 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 June 30, 2013		Three Months Ended June 30, 2012
Cost of goods sold	$	13	$	27
Research and development	354		75
Selling, general and administrative	367		236
Stock-based compensation expense	$	734	$	338

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	1,585,200		0.92
Exercised	—		—
Forfeited, cancelled or expired	(26,083	)	1.49
Options outstanding at June 30, 2013	13,350,882		$	1.28	5.87	$	2,055,658

Options fully vested at June 30, 2013 and those expected to vest beyond June 30, 2013	13,011,245		$	1.29	5.78	$	1,972,213

Options exercisable at June 30, 2013	9,605,095		$	1.38	4.60	$	1,250,937

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

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

Summary of restricted stock unit activity

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

Granted	530,060		0.95
Vested and issued	(292,914	)	1.13
Forfeited	(18,320	)	0.96

Nonvested restricted stock units outstanding at June 30, 2013	1,685,922		$	1.05
Restricted stock units expected to vest beyond June 30, 2013	1,515,907		$	1.05

- 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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