Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

Stock-Based Compensation (Tables)

6 Months Ended

Sep. 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						Six Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
Cost of goods sold		$	31		$	8		$	52		$	21
Research and development		83			63			160			416
Selling, general and administrative		423			379			1,011			747
Stock-based compensation expense		$	537		$	450		$	1,223		$	1,184

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		(312,241	)	0.95
Forfeited, cancelled or expired		(272,572	)	1.83
Options outstanding at September 30, 2014		13,352,675		$	1.28		5.2		$	954,088

Options fully vested at September 30, 2014 and those expected to vest beyond September 30, 2014		13,140,614		$	1.28		5.1		$	944,287

Options exercisable at September 30, 2014		10,201,263		$	1.31		4.1		$	752,401

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,
		2014		2013			2014			2013
Risk-free interest rates		—		1.9		%	1.8		%	0.9		%
Expected lives (in years)		—		5.7			5.7			5.7
Dividend yield		—		—		%	—		%	—		%
Expected volatility		—		76.0		%	77.0		%	77.3		%
Weighted average grant date fair value of options granted during the period		—		$	1.10		$	0.94		$	0.93

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		878,206		1.43
Vested and issued		(765,803	)	1.13
Forfeited		(55,150	)	1.27

Nonvested restricted stock units outstanding at September 30, 2014		2,118,477		$	1.23
Restricted stock units expected to vest beyond September 30, 2014		1,922,918		$	1.23