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Reserved Shares of authorized but Unissued Common Stock (Detail)	Mar. 31, 2013
Share Based Compensation Shares Authorized Under Award Type [Line Items]
Common stock	5,350,828
Employee Stock Option
Share Based Compensation Shares Authorized Under Award Type [Line Items]
Common stock	5,088,612
Employee Stock Purchase Plans
Share Based Compensation Shares Authorized Under Award Type [Line Items]
Common stock	257,734
Common Stock Warrants
Share Based Compensation Shares Authorized Under Award Type [Line Items]
Common stock	4,482

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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