Discontinued Operation (Details) (USD $)	1 Months Ended	12 Months Ended
	Oct. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009 Y	Oct. 01, 2009
Discontinued operation
Net gain on sale of discontinued operation		$ 1,725,000	$ 0	$ 13,623,000
Reversal of deferred rent related to facilities exited		60,000	29,000
Summary of restructuring charges activity during the period
Balance of restructuring accrual at the beginning of the period		1,340,000	1,234,000	1,876,000
Restructuring charges		669,000	788,000	56,000
Cash payments		(1,046,000)	(763,000)	(772,000)
Accretion of prior restructuring costs		27,000	52,000	74,000
Balance of restructuring accrual at the end of the period		1,050,000	1,340,000	1,234,000
Facility Exit Costs
Discontinued operation
Reversal of deferred rent related to facilities exited		60,000	29,000
Summary of restructuring charges activity during the period
Balance of restructuring accrual at the beginning of the period		1,340,000	1,234,000	1,735,000
Restructuring charges		67,000	788,000	60,000
Cash payments		(1,046,000)	(763,000)	(635,000)
Accretion of prior restructuring costs		27,000	52,000	74,000
Balance of restructuring accrual at the end of the period		448,000	1,340,000	1,234,000
Severance and Benefits
Summary of restructuring charges activity during the period
Balance of restructuring accrual at the beginning of the period				141,000
Restructuring charges		602,000		(4,000)
Cash payments				(137,000)
Balance of restructuring accrual at the end of the period		602,000
MicroEdge
Discontinued operation
Value of net assets sold					3,000,000
Total consideration received in connection with the divestiture of business	30,000,000
Consideration received as cash on closing date	27,000,000
Purchase price placed in escrow	3,000,000
Net gain on sale of discontinued operation		1,725,000		13,623,000
Term of service and maintenance agreement, future payments related to which have been excluded from sale of discontinued operations (in years)				2
Period of sub-lease agreement with purchaser (in years)				7
Summary of restructuring charges activity during the period
Balance of restructuring accrual at the beginning of the period		5,249,000	5,115,000
Restructuring charges		(206,000)	17,000
Cash payments		(174,000)	(48,000)
Accretion of prior restructuring costs		165,000	165,000
Balance of restructuring accrual at the end of the period		5,034,000	5,249,000	5,115,000
MicroEdge | Facility Exit Costs
Discontinued operation
Restructuring accrual adjustment benefit as a result of the amendment to the sub-lease agreement		200,000
Summary of restructuring charges activity during the period
Balance of restructuring accrual at the beginning of the period		5,249,000	5,115,000
Restructuring charges		(206,000)	9,000
Cash payments		(174,000)	(40,000)
Accretion of prior restructuring costs		165,000	165,000
Balance of restructuring accrual at the end of the period		5,034,000	5,249,000
Restructuring accrual included in accrued liabilities		400,000
MicroEdge | Severance and Benefits
Summary of restructuring charges activity during the period
Restructuring charges			8,000
Cash payments			$ (8,000)