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Stock-Based Compensation (Details) (USD $)	99 Months Ended
Stock-Based Compensation (Details) (USD $)	Mar. 31, 2012
Employee stock purchase plan
Information related to stock-based compensation
Shares of common stock approved and authorized for issuance	2,025,000
Shares remaining available for issuance	556,546
Stock issued during period	1,468,454
Cumulative average sale price per share as of the period end (in dollars per share)	$ 10.15
2004 Equity Incentive Plan
Information related to stock-based compensation
Shares remaining available for issuance	720,587

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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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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