Stock-Based Compensation (Tables)

6 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Assumptions Used

The fair values of the employee stock purchase rights granted are estimated as of the grant date using the Black-Scholes option-pricing model with the following assumptions:

	Three Months Ended September 30,						Six Months Ended September 30,
	2015			2014			2015			2014
Expected life (years)	0.5			0.5			0.5			0.5
Risk-free interest rate	0.1		%	0.1		%	0.1		%	0.1		%
Volatility	57		%	57		%	57		%	57		%
Weighted average fair value	$	1.80		$	2.57		$	1.80		$	2.57

Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units

The following tables summarize the allocation of the stock-based compensation expense (in thousands):

Stock-based compensation expense by type of grant:	Three Months Ended September 30,					Six Months Ended September 30,
	2015			2014		2015			2014
Stock options and stock purchase rights	$	289		$	292	$	496		$	706
RSUs	5,650			3,936		11,547			8,720
	5,939			4,228		12,043			9,426
Stock-based compensation (capitalized to) expensed from inventory	(5		)	2		(17		)	20
Total	$	5,934		$	4,230	$	12,026		$	9,446

Summary of Stock-Based Compensation Expense

Stock-based compensation expense by cost centers:	Three Months Ended September 30,					Six Months Ended September 30,
	2015			2014		2015			2014
Cost of revenues	$	121		$	100	$	226		$	129
Research and development	3,955			2,776		8,015			6,047
Selling, general and administrative	1,863			1,352		3,802			3,250
	$	5,939		$	4,228	$	12,043		$	9,426
Stock-based compensation (capitalized to) expensed from inventory	(5		)	2		(17		)	20
Total	$	5,934		$	4,230	$	12,026		$	9,446