Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended												1 Months Ended			12 Months Ended										12 Months Ended					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 $ 0.00 - $2.48 [Member]	Dec. 31, 2013 $ 2.48 - $4.97 [Member]	Dec. 31, 2013 $ 4.97 - $7.46 [Member]	Dec. 31, 2013 $ 7.46 - $9.95 [Member]	Dec. 31, 2013 $ 9.95 - $12.44 [Member]	Dec. 31, 2013 $ 12.44 - $14.92 [Member]	Dec. 31, 2013 $ 14.92 - $17.41 [Member]	Dec. 31, 2013 $ 17.41 - $19.90 [Member]	Dec. 31, 2013 Employee Plan [Member] Plan	Jun. 30, 2013 2005 Equity Incentive Plan [Member]	Jun. 30, 2011 2005 Equity Incentive Plan [Member]	Dec. 31, 2012 2005 Equity Incentive Plan [Member]	Dec. 31, 2013 2005 Equity Incentive Plan [Member] Minimum [Member]	Dec. 31, 2013 2005 Equity Incentive Plan [Member] Maximum [Member]	Dec. 31, 2013 1998 Director Stock Option Plan [Member] Plan	Dec. 31, 2013 Employee Stock Purchase Plan [Member]	Dec. 31, 2012 Employee Stock Purchase Plan [Member]	Dec. 31, 2011 Employee Stock Purchase Plan [Member]	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2013 Stock Options [Member] 1998 Director Stock Option Plan [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2013 Non statutory stock options [Member]	Dec. 31, 2013 Non statutory stock options [Member] 2005 Equity Incentive Plan [Member]	Dec. 31, 2013 Incentive stock options [Member] 2005 Equity Incentive Plan [Member]	Dec. 31, 2013 Software and other [Member]	Dec. 31, 2012 Software and other [Member]	Dec. 31, 2011 Software and other [Member]	Dec. 31, 2013 Professional Services [Member]	Dec. 31, 2012 Professional Services [Member]	Dec. 31, 2011 Professional Services [Member]	Dec. 31, 2013 Maintenance [Member]	Dec. 31, 2012 Maintenance [Member]	Dec. 31, 2011 Maintenance [Member]	Dec. 31, 2013 Sales and Marketing [Member]	Dec. 31, 2012 Sales and Marketing [Member]	Dec. 31, 2011 Sales and Marketing [Member]	Dec. 31, 2013 Product Research and Development [Member]	Dec. 31, 2012 Product Research and Development [Member]	Dec. 31, 2011 Product Research and Development [Member]	Dec. 31, 2013 General and Administrative [Member]	Dec. 31, 2012 General and Administrative [Member]	Dec. 31, 2011 General and Administrative [Member]	Dec. 31, 2013 Restructuring and other expenses [Member]	Dec. 31, 2012 Restructuring and other expenses [Member]	Dec. 31, 2011 Restructuring and other expenses [Member]
Employee Service Share Based Compensation, Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 4,839	$ 5,786	$ 3,908																												$ 20	$ 0	$ 0	$ 91	$ 90	$ 45	$ 44	$ 40	$ 186	$ 1,243	$ 1,805	$ 1,460	$ 498	$ 451	$ 36	$ 2,749	$ 3,400	$ 2,181	$ 194	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock award plans												3						1
Additional shares authorized (in shares)													2,000,000	3,000,000
Number of shares of common stock authorized for issuance (in shares)													18,500,000		16,500,000										300,000					5,000,000
Vesting period																3 years	4 years									3 years
Options outstanding (in shares)																						8,918,290	12,172,452	9,191,034				20,000	8,898,290
Assumptions used to estimate the fair value of stock option awards [Abstract]
Dividend yield (in hundredths)	0.00%	0.00%	0.00%
Expected volatility (in hundredths)	65.00%	65.00%	100.00%
Risk-free interest rate, minimum (in hundredths)	0.30%	0.30%	0.60%
Risk-free interest rate, maximum (in hundredths)	1.00%	0.80%	1.80%
Expected term (in years)	3 years	3 years	4 years
Weighted-average grant date fair value (in dollars per share)	$ 1.99	$ 3.51	$ 3.37
Unrecognized compensation cost related to stock options																						10,137
Weighted-average period over which compensation cost to be recognized																						2 years 6 months
Number of Options [Abstract]
Options outstanding (in shares)																						12,172,452	9,191,034					20,000	8,898,290
Options granted (in shares)																						1,120,000	4,455,000
Options exercised (in shares)																						(902,500)	(190,269)
Options forfeited and expired (in shares)																						(3,471,662)	(1,283,313)
Options outstanding (in shares)																						8,918,290	12,172,452	9,191,034				20,000	8,898,290
Options exercisable (in shares)																						6,185,165	5,545,382	4,215,920
Weighted-Average Exercise Price [Abstract]
Options outstanding (in dollars per share)																						$ 3.63	$ 3.14
Options granted (in dollars per share)																						$ 3.19	$ 5.19
Options exercised (in dollars per share)																						$ 1.37	$ 3.62
Options forfeited and expired (in dollars per share)																						$ 4.37	$ 5.60
Options outstanding (in dollars per share)																						$ 3.51	$ 3.63	$ 3.14
Options exercisable (in dollars per share)																						$ 3.06	$ 2.50	$ 2.78
Weighted-Average Remaining Contractual Term (In Years) [Abstract]
Options outstanding																						2 years 6 months	4 years 1 month 6 days	5 years 2 months 12 days
Options outstanding																						2 years 6 months	4 years 1 month 6 days	5 years 2 months 12 days
Options exercisable																						1 year 9 months 18 days	3 years 4 months 24 days	4 years 7 months 6 days
Aggregate Intrinsic Value [Abstract]
Options outstanding																						3,767	17,860
Options exercised																						1,238	506
Options outstanding																						2,391	3,767	17,860
Options exercisable																						2,391	3,765	10,381
Number of shares
Restricted stock outstanding (in shares)																										0
Restricted stock granted (in shares)																										2,100,000	505,038
Restricted stock vested (in shares)																										0
Restricted stock forfeited (in shares)																										0
Restricted stock outstanding (in shares)																										2,100,000	0
Weighted-Average Grant-date Fair Value
Restricted stock outstanding (in dollars per share)																										$ 0
Restricted stock granted (in dollars per share)																										$ 2.47	$ 3.62
Restricted stock vested (in dollars per share)																										$ 0
Restricted stock forfeited (in dollars per share)																										$ 0
Restricted stock outstanding (in dollars per share)																										$ 2.47	$ 0
Weighted-Average Remaining Vesting Term
Restricted stock outstanding, Vesting period term																										2 years 10 months 24 days
Proceeds from stock options exercised																										1,236	688
Summary of stock options outstanding by exercise price range [Abstract]
Options outstanding - Range of exercise prices, Minimum (in dollars per share)				$ 0	$ 2.48	$ 4.97	$ 7.46	$ 9.95	$ 12.44	$ 14.92	$ 17.41
Options outstanding - Range of exercise prices, Maximum (in dollars per share)				$ 2.48	$ 4.97	$ 7.46	$ 9.95	$ 12.44	$ 14.92	$ 17.41	$ 19.90
Options outstanding - Number of shares (in shares)	8,918,290			1,945,000	4,647,324	2,274,272	0	1,694	0	20,000	30,000
Options outstanding - Weighted-average remaining contractual life in years	2 years 6 months			2 years 1 month 6 days	2 years 1 month 6 days	3 years 7 months 6 days	0 years	3 years 3 months 18 days	0 years	0 years 4 months 24 days	1 year 4 months 24 days
Options outstanding - Weighted-average exercise price (in dollars per share)	$ 3.51			$ 1.09	$ 3.09	$ 6.13	$ 0	$ 10.81	$ 0	$ 16.19	$ 17.50
Options exercisable - Number of shares (in shares)	6,185,165			1,938,750	3,241,699	953,022	0	1,694	0	20,000	30,000
Options exercisable - Weighted-average exercise price (in dollars per share)	$ 3.06			$ 1.09	$ 3.13	$ 6.05	$ 0	$ 10.81	$ 0	$ 16.19	$ 17.50
Fair value of stock awards vested [Abstract]
Total fair value of restricted stock awards vested	0	1,591	0
Maximum number of shares to be purchase specified as percentage of eligible compensation (in hundredths)																			10.00%
Percentage of discount from the market price at the end of each calendar quarter (in hundredths)																			5.00%
Amount contributed by employee under employee stock purchase plan	$ 253	$ 353	$ 294																$ 253	$ 353	$ 294