Discontinued Operation (Details) (USD $)	12 Months Ended						1 Months Ended	12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Facility Exit Costs	Dec. 31, 2011 Facility Exit Costs	Dec. 31, 2010 Facility Exit Costs	Oct. 31, 2009 MicroEdge	Dec. 31, 2011 MicroEdge	Dec. 31, 2009 MicroEdge Y	Dec. 31, 2012 MicroEdge	Oct. 02, 2009 MicroEdge	Dec. 31, 2012 MicroEdge Facility Exit Costs	Dec. 31, 2011 MicroEdge Facility Exit Costs
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
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)									2
Summary of restructuring charges activity during the period
Balance of restructuring accrual at the beginning of the period	1,050,000	1,340,000	1,234,000	448,000	1,340,000	1,234,000						5,034,000	5,249,000
Restructuring charges	3,630,000	669,000	788,000	76,000	67,000	788,000						(439,000)	(206,000)
Cash payments	(1,542,000)	(1,046,000)	(763,000)	(524,000)	(1,046,000)	(763,000)						(721,000)	(174,000)
Accretion of prior restructuring costs	4,000	27,000	52,000	4,000	27,000	52,000
Adjustment of prior restructuring costs		60,000	29,000		60,000	29,000						156,000	165,000
Balance of restructuring accrual at the end of the period	3,142,000	1,050,000	1,340,000	4,000	448,000	1,340,000						4,030,000	5,034,000
Restructuring accrual included in current liabilities of discontinued operations	$ 262,000	$ 488,000						$ 488,000		$ 262,000		$ 200,000