Significant Accounting Policies, Stock-based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	$ 870	$ 911	$ 2,434	$ 2,938
Employee Stock Purchase Plan ("ESPP") [Member]
Fair value assumptions for stock options granted [Abstract]
Risk free interest rate (in hundredths)	0.09%	0.20%	0.09%	0.20%
Expected term	6 months	6 months	6 months	6 months
Volatility (in hundredths)	42.80%	71.70%	42.80%	71.70%
Expected dividend (in hundredths)	0.00%	0.00%	0.00%	0.00%
Weighted average fair value (in dollars per share)	$ 1.18	$ 0.98	$ 1.18	$ 0.98
Stock-based compensation expense	24	20	72	53
Cost of service [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	84	85	241	272
Cost of software and other [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	3	3	8	25
Research and development [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	192	252	530	819
Sales and marketing [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	103	96	285	372
General and administrative
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	488	475	1,370	1,450
Stock options [Member]
Fair value assumptions for stock options granted [Abstract]
Risk free interest rate (in hundredths)	1.20%	0.50%	0.70%	0.60%
Expected term	3 years 7 months 6 days	3 years 8 months 12 days	3 years 8 months 12 days	3 years 8 months 12 days
Volatility (in hundredths)	57.10%	57.00%	56.70%	57.50%
Expected dividend (in hundredths)	0.00%	0.00%	0.00%	0.00%
Weighted average fair value (in dollars per share)	$ 2.42	$ 1.35	$ 1.84	$ 1.18
Stock-based compensation expense	246	821	1,375	2,786
Restricted Stock Units ("RSUs") [Member]
Fair value assumptions for stock options granted [Abstract]
Stock-based compensation expense	$ 600	$ 70	$ 987	$ 99