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Capitalized Software Development Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 years	Dec. 31, 2010	Mar. 31, 2011
Capitalized Software Development Costs [Abstract]
Net capitalized software development costs	$ 102		$ 102		$ 255
Amortization included as cost of product revenue	$ 51	$ 51	$ 153	$ 102
Capitalized computer software, amortization period (years)			2

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.