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Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-based compensation expense by type of award:
Total stock-based compensation	$ 223	$ 132	$ 435	$ 266
Employee stock options [Member]
Stock-based compensation expense by type of award:
Total stock-based compensation	206	132	401	266
Non-employee stock options [Member]
Stock-based compensation expense by type of award:
Total stock-based compensation	$ 17		$ 34

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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