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Stock-Based Compensation (Details)	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of stock options and awards
Common stock shares available for grant	2,037,130
Common stock options outstanding	3,738,174	3,155,631	3,267,838
Stock Options [Member]
Schedule of stock options and awards
Common stock options outstanding	3,738,174
Restricted Stock Awards [Member]
Schedule of stock options and awards
Restricted stock outstanding	44,000	44,000	18,000
Restricted Stock Units [Member]
Schedule of stock options and awards
Restricted stock outstanding	794,165	708,651	407,765

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References+ Details

- 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.

+ References+ Details