Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
(1) Stock-based compensation included in costs and expenses:
Total costs and expenses allocated to stock-based compensation	$ 406	$ 606	$ 1,065	$ 1,630
Costs of services
(1) Stock-based compensation included in costs and expenses:
Total costs and expenses allocated to stock-based compensation	34	40	94	83
Costs of product sales
(1) Stock-based compensation included in costs and expenses:
Total costs and expenses allocated to stock-based compensation	2		2
Selling, general and administrative
(1) Stock-based compensation included in costs and expenses:
Total costs and expenses allocated to stock-based compensation	362	561	951	1,534
Product development
(1) Stock-based compensation included in costs and expenses:
Total costs and expenses allocated to stock-based compensation	$ 8	$ 5	$ 18	$ 13