Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2014

Stockholders' Equity

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 December 31,						Nine Months Ended December 31,
		2014			2013			2014			2013
Cost of goods sold		$	33		$	13		$	85		$	34
Research and development		84			73			244			490
Selling, general and administrative		454			395			1,466			1,140
Stock-based compensation expense		$	571		$	481		$	1,795		$	1,664

Summary of stock option activity

		Shares		Weighted Average Exercise Price			Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Options outstanding at March 31, 2014		12,851,688		$	1.27
Granted		1,085,800		1.43
Exercised		(322,241	)	0.94
Forfeited, cancelled or expired		(307,572	)	1.82
Options outstanding at December 31, 2014		13,307,675		$	1.28		5.0		$	5

Options fully vested at December 31, 2014 and those expected to vest beyond December 31, 2014		13,307,675		$	1.28		5.0		$	5

Options exercisable at December 31, 2014		10,393,134		$	1.31		4.0		$	5

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,
		2014		2013		2014			2013
Risk-free interest rates		—		—		1.8		%	0.9		%
Expected lives (in years)		—		—		5.7			5.7
Dividend yield		—		—		—		%	—		%
Expected volatility		—		—		77.0		%	77.3		%
Weighted average grant date fair value of options granted during the period		—		—		$	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		919,666		1.41
Vested and issued		(796,575	)	1.13
Forfeited		(63,300	)	1.25

Nonvested restricted stock units outstanding at December 31, 2014		2,121,015		$	1.23
Restricted stock units expected to vest beyond December 31, 2014		1,948,599		$	1.23