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Common Stock - Reserved Shares of Common Stock (Details) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Warrants	17	17
Options	3,655	4,684
Restricted stock units	421	137
Total outstanding	4,093	4,838

- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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