Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stockholders' equity
Stock-based compensation expense	$ 1,601	$ 1,652	$ 2,418
Cost of goods sold
Stockholders' equity
Stock-based compensation expense	92	136	209
Research and development
Stockholders' equity
Stock-based compensation expense	319	324	211
Selling, general and administrative
Stockholders' equity
Stock-based compensation expense	$ 1,190	$ 1,192	$ 1,998

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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