Consolidated Statements of Comprehensive Loss (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amounts include stock-based compensation cost as follows:
Stock-based compensation	$ 1,314	$ 1,670	$ 2,265
Cost of Revenue
Amounts include stock-based compensation cost as follows:
Stock-based compensation	63	61	94
Research and Product Development
Amounts include stock-based compensation cost as follows:
Stock-based compensation	297	244	362
Sales and Marketing
Amounts include stock-based compensation cost as follows:
Stock-based compensation	250	350	421
General and Administrative
Amounts include stock-based compensation cost as follows:
Stock-based compensation	$ 704	$ 1,015	$ 1,388