Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2015

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

Schedule of Assumptions Used

The Company did not grant employee stock purchase rights during the three months ended December 31, 2015. The fair values of the employee stock purchase rights granted during the nine months ended December 31, 2015 and 2014 are estimated as of the grant date using the Black-Scholes option-pricing model with the following assumptions:

	Nine Months Ended December 31,
	2015			2014
Expected life (years)	0.5			0.5
Risk-free interest rate	0.1		%	0.1		%
Volatility	57		%	57		%
Weighted average fair value	$	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 December 31,						Nine Months Ended December 31,
	2015			2014			2015			2014
Stock options and stock purchase rights	$	352		$	454		$	848		$	1,160
RSUs	5,800			4,428			17,347			13,148
	6,152			4,882			18,195			14,308
Stock-based compensation capitalized to inventory	(11		)	(25		)	(28		)	(5		)
Total	$	6,141		$	4,857		$	18,167		$	14,303

Summary of Stock-Based Compensation Expense

Stock-based compensation expense by cost centers:	Three Months Ended December 31,						Nine Months Ended December 31,
	2015			2014			2015			2014
Cost of revenues	$	151		$	97		$	377		$	226
Research and development	4,500			2,992			12,515			9,039
Selling, general and administrative	1,501			1,793			5,303			5,043
	6,152			4,882			18,195			14,308
Stock-based compensation capitalized to inventory	(11		)	(25		)	(28		)	(5		)
Total	$	6,141		$	4,857		$	18,167		$	14,303