Significant Accounting Policies, Stock-based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Jun. 30, 2011
Stock-based Compensation [Abstract]
Stock options granted (in shares)	296,000	224,000	696,650	1,395,000
Fair value assumptions for stock options granted [Abstract]
Employee Stock Purchase Plan, number of shares reserved (in shares)						1,000,000
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	$ 911,000	$ 937,000	$ 2,939,000	$ 2,811,000
Number of Shares [Roll Forward]
Options outstanding beginning balance (in shares)			10,789,590
Stock options granted (in shares)	296,000	224,000	696,650	1,395,000
Stock options exercised (in shares)			(414,081)
Stock options forfeited (in shares)			(616,171)
Options outstanding ending balance (in shares)	10,455,988		10,455,988		10,789,590
Options vested and expected to vest (in shares)	10,365,893		10,365,893
Outstanding and exercisable at the end of the period (in shares)	7,263,479		7,263,479
Weighted Average Exercise Price [Roll Forward]
Options outstanding, weighted average exercise price, beginning balance (in dollars per share)			$ 2.99
Granted in period, weighted average exercise price (in dollars per share)			$ 3.19
Exercised in period, weighted average exercise price (in dollars per share)			$ 2.37
Forfeited in period, weighted average exercise price (in dollars per share)			$ 2.89
Options outstanding, weighted average exercise price, ending balance (in dollars per share)	$ 3.00		$ 3.00		$ 2.99
Vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 2.99		$ 2.99
Exercisable, weighted average exercise price (in dollars per share)	$ 2.90		$ 2.90
Weighted Average Remaining Contractual Term [Abstract]
Average remaining contractual term			3 years 6 months		4 years 3 months
Options vested and expected to vest			3 years 5 months 23 days
Outstanding and exercisable at the end of the period			2 years 8 months 8 days
Aggregate Intrinsic Value [Abstract]
Options outstanding, Aggregate Intrinsic Value	14,744,000		14,744,000		8,000
Options vested and expected to vest	14,675,000		14,675,000
Options exercisable, Aggregate Intrinsic Value	10,475,000		10,475,000
Options exercised in period, total intrinsic value	195,000	9,000	401,000	608,000
Fair value of options vested	900,000	1,000,000	2,900,000	2,800,000
Nonvested awards, compensation cost not yet recognized	3,700,000		3,700,000
Nonvested awards, unrecognized cost, period for recognition			1 year 8 months 12 days
Stock options [Member]
Fair value assumptions for stock options granted [Abstract]
Risk free interest rate (in hundredths)	0.50%	0.60%	0.60%	1.30%
Expected term	3 years 8 months 12 days	3 years 7 months 6 days	3 years 8 months 12 days	3 years 2 months 12 days
Volatility (in hundredths)	57.00%	58.50%	57.50%	54.00%
Expected dividend (in hundredths)	0.00%	0.00%	0.00%	0.00%
Weighted average fair value (in dollars per share)	$ 1.35	$ 1.65	$ 1.18	$ 2.52
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	821,000	918,000	2,787,000	2,784,000
Restricted Stock Units [Member]
Fair value assumptions for stock options granted [Abstract]
Restricted stock units grants in period (in shares)			98,363
Fair market value per share (in dollars per share)	$ 2.82		$ 2.82
ESPP Compensation Expense [Member]
Fair value assumptions for stock options granted [Abstract]
Risk free interest rate (in hundredths)	0.20%	0.10%	0.20%	0.10%
Expected term	6 months	6 months	6 months	6 months
Volatility (in hundredths)	71.70%	45.90%	71.70%	45.90%
Expected dividend (in hundredths)	0.00%	0.00%	0.00%	0.00%
Weighted average fair value (in dollars per share)	$ 0.98	$ 1.20	$ 0.9	$ 1.20
Life of Employee Stock Purchase Plan			10 years
Minimum purchase price of market price (in hundredths)				85.00%
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	21,000	19,000	53,000	27,000
Cost of Services [Member] | Stock options [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	73,000	51,000	239,000	156,000
Cost of Services [Member] | ESPP Compensation Expense [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	13,000	10,000	33,000	14,000
Research and Development Expense [Member] | Stock options [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	248,000	197,000	810,000	539,000
Research and Development Expense [Member] | ESPP Compensation Expense [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	4,000	5,000	9,000	7,000
Sales and marketing [Member] | Stock options [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	95,000	144,000	368,000	445,000
Sales and marketing [Member] | ESPP Compensation Expense [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	1,000	1,000	4,000	3,000
Cost of software [Member] | Stock options [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	3,000	7,000	24,000	12,000
Cost of software [Member] | ESPP Compensation Expense [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	0	0	1,000	0
General and administrative | Stock options [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	402,000	519,000	1,346,000	1,632,000
General and administrative | ESPP Compensation Expense [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	3,000	3,000	6,000	3,000
General and administrative | ESPP Compensation Expense [Member] | Restricted Stock Units [Member]
Stock-based compensation expense [Abstract]
Allocated stock-based compensation expense	$ 70,000	$ 0	$ 99,000	$ 0