Subsequent event Subsequent Event (Details)	Mar. 30, 2013	Apr. 29, 2013 Common Stock [Member] 2013 Equity Incentive Plan [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Number of shares authorized to be issued	5,000,000	3,500,000.0

- Definition

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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