Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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- Definition

Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Employee Stock Purchase Plan (Details) (2011 Employee Stock Purchase Plan, USD $)	1 Months Ended		6 Months Ended	12 Months Ended
	Jul. 31, 2012	Jan. 31, 2012	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
2011 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering periods				6 months
Discount on closing market price (as a percent)				15.00%
Number of shares allocated to the plan				300,000
Shares issued	47,067	25,905		72,793		49,739
Amount received on issuance of shares			$ 91,000	$ 170,599	$ 80,000	$ 145,000
Compensation expense				$ (19,000)	$ 80,000