Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 177	$ 313
Preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000us-gaap_CommonStockSharesAuthorized	150,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	50,717,718us-gaap_CommonStockSharesIssued	49,922,959us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	41,217,480us-gaap_CommonStockSharesOutstanding	41,165,784us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	9,500,238us-gaap_TreasuryStockShares	8,757,175us-gaap_TreasuryStockShares

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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