Current Liabilities and Debt Obligations (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended			9 Months Ended	12 Months Ended							3 Months Ended		9 Months Ended							3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Senior Redeemable Preferred Stock [Member]	May 11, 2012 Senior Redeemable Preferred Stock [Member]	Sep. 27, 2010 Senior Redeemable Preferred Stock [Member]	Sep. 30, 2012 Public Preferred Stock [Member]	Dec. 31, 2011 Public Preferred Stock [Member]	Dec. 31, 1991 Public Preferred Stock [Member]	Dec. 31, 1990 Public Preferred Stock [Member]	Jun. 30, 2011 IT Logistics, Inc [Member]	Sep. 30, 2012 Wells Fargo [Member]	Sep. 30, 2012 Term Loan [Member] Wells Fargo [Member]	Dec. 31, 2011 Term Loan [Member] Wells Fargo [Member]	Sep. 30, 2012 Revolving credit [Member] Wells Fargo [Member]	Sep. 30, 2011 Revolving credit [Member] Wells Fargo [Member]	Sep. 30, 2012 Revolving credit [Member] Wells Fargo [Member]	Sep. 30, 2011 Revolving credit [Member] Wells Fargo [Member]	Dec. 31, 2011 Revolving credit [Member] Wells Fargo [Member]	Sep. 27, 2010 Revolving credit [Member] Wells Fargo [Member]	Sep. 30, 2012 Revolving credit [Member] Prime Rate [Member] Wells Fargo [Member]	Sep. 30, 2012 Revolving credit [Member] Federal Funds Rate [Member] Wells Fargo [Member]	Sep. 30, 2012 Revolving credit [Member] Libor Rate [Member] Wells Fargo [Member]	Sep. 30, 2012 Liability Due in Installments [Member] IT Logistics, Inc [Member]	Sep. 30, 2012 Liability Due in Installments [Member] IT Logistics, Inc [Member]	Jun. 30, 2011 Liability Due in Installments [Member] IT Logistics, Inc [Member]	Nov. 01, 2012 Subordinated Promissory Note [Member] IT Logistics, Inc [Member]	Sep. 30, 2012 Subordinated Promissory Note [Member] IT Logistics, Inc [Member]	Dec. 31, 2011 Subordinated Promissory Note [Member] IT Logistics, Inc [Member]	Jun. 30, 2011 Subordinated Promissory Note [Member] IT Logistics, Inc [Member]	Sep. 30, 2012 Short-term [Member] Term Loan [Member]		Sep. 30, 2012 Long-term [Member]	Sep. 30, 2012 Long-term [Member] Term Loan [Member]		Sep. 30, 2012 Long-term [Member] Revolving credit [Member]
Accounts Payable and Other Accrued Payables [Abstract]
Accrued trade payables	$ 19,000,000		$ 19,000,000		$ 16,000,000
Trade account payables	9,500,000		9,500,000		5,900,000
Senior Revolving Credit Facility [Abstract]
Maximum borrowing capacity, before amendment																	25,000,000		25,000,000
Maximum revolving credit facility																	30,000,000		30,000,000
Amended expiration date of revolving credit facility																			May 17, 2014
Term loan component of Facility																	7,500,000		7,500,000
Principal amount of term loan repaid in quarterly installments																			93,750
Percentage added to reference rate to compute the variable rate (in hundredths)																							1.00%	1.50%	2.00%
Percentage elected to be added to reference rate to compute the variable rate (in hundredths)																									3.75%
Maximum redemption of senior redeemable preferred stock allowed under amended Facility							4,000,000	2,500,000														2,500,000
Discount rate on senior redeemable preferred stock redemption							10.00%	10.00%
Interest rate on credit facility (in hundredths)														4.25%
Interest expense	1,603,000	1,655,000	5,083,000	4,575,000													200,000	200,000	600,000	500,000						0	4,000
Percentage of term loan amortized per year (in hundredths)																	5.00%		5.00%
Remaining borrowing capacity																	16,000,000		16,000,000		5,300,000
Outstanding borrowing of credit facility															6,700,000	6,900,000	6,900,000		6,900,000		17,900,000
Weighted average interest rates on outstanding borrowings (in hundredths)																	5.40%		5.40%		6.60%
Maturities of facility presented by year [Abstract]
2012	375,000		375,000																														375,000		0	0		0
2013	375,000		375,000																														0		375,000	375,000		0
2014	6,157,000		6,157,000																														0		6,157,000	5,906,000		251,000
Total	6,907,000		6,907,000																														375,000	[1]	6,532,000	6,281,000	[1]	251,000	[2]
Notes payable - IT Logistics, Inc [Abstract]
Cash paid at inception of acquisition													8,000,000
Note payable amount due in installments																										7,000,000	7,000,000
Number of installments																												10
Monthly installments due																											700,000
Interest rate of notes (in hundredths)																										0.50%	0.50%		6.00%
Preferred stock dividend rate per annum (in hundredths)						14.125%			12.00%	12.00%	6.00%	6.00%
Face value of debt instrument																													15,000,000	15,000,000	15,000,000	15,000,000
Carrying amount of debt instrument																														12,500,000	12,100,000
Fair value of debt instrument																																11,700,000
Subordinated promissory notes accreted period (in months)																														60 months
Warranty Liability [Abstract]
Accrued warranty liability	$ 500,000		$ 500,000		$ 1,000,000

[1] The principal will be repaid in quarterly installments of $93,750, with a final installment of the unpaid principal amount payable on May 17, 2014.

[2] Balance due represents balance as of September 30, 2012, with fluctuating balances based on working capital requirements of the Company.