Significant Accounting Policies, Stock-based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	$ 796	$ 995
Employee Stock Purchase Plan ("ESPP") [Member]
Fair value assumptions for stock options granted [Abstract]
Risk free interest rate (in hundredths)	0.10%	0.04%
Expected term	6 months	6 months
Volatility (in hundredths)	53.60%	75.30%
Expected dividend (in hundredths)	0.00%	0.00%
Weighted average grant-date fair value (in dollars per share)	$ 1.30	$ 0.77
Stock-based compensation expense	28	15
Cost of service [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	92	93
Cost of software and other [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	3	10
Research and development [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	209	286
Sales and marketing [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	108	138
General and administrative
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	384	468
Stock options [Member]
Fair value assumptions for stock options granted [Abstract]
Risk free interest rate (in hundredths)	0.60%	0.60%
Expected term	3 years 8 months 12 days	3 years 7 months 6 days
Volatility (in hundredths)	56.50%	57.50%
Expected dividend (in hundredths)	0.00%	0.00%
Weighted average grant-date fair value (in dollars per share)	$ 1.75	$ 0.98
Stock-based compensation expense	657	980
Restricted Stock Units ("RSUs") [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	$ 111	$ 0