Short-Term Borrowings and Other Debt (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2012 letters_of_credit		Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2012 letters_of_credit		Sep. 30, 2011	Dec. 31, 2011
Components of short-term borrowings and other debt
Notes payable	$ 246,000				$ 246,000			$ 370,000
Capital lease obligations	4,270,000				4,270,000			5,280,000
Short-term borrowings and other debt	4,516,000				4,516,000			5,650,000
Capital leases entered into				6,300,000
Capital lease interest expense	100,000		100,000		100,000		100,000
Number of letters of credit, in letters of credit	4				4
Future minimum lease payments for capital lease obligations
2012	386,000				386,000
2013	1,541,000				1,541,000
2014	1,402,000				1,402,000
2015	1,051,000				1,051,000
2016	194,000				194,000
Thereafter	0				0
Subtotal	4,574,000				4,574,000
Less: Amount representing interest	(304,000)	[1]			(304,000)	[1]
Total	4,270,000				4,270,000
Repayments on long-term and short-term borrowings
2012	46,000				46,000
2013	183,000				183,000
2014	46,000				46,000
2015	0				0
2016	0				0
Thereafter	0				0
Subtotal	275,000				275,000
Less: Amount representing interest	(29,000)	[1]			(29,000)	[1]
Notes payable	246,000				246,000			370,000
Minimum [Member]
Components of short-term borrowings and other debt
Capital leases, term					48 months
Capital leases, interest rate	0.60%				0.60%
Maximum [Member]
Components of short-term borrowings and other debt
Capital leases, term					60 months
Capital leases, interest rate	6.14%				6.14%
Letter of Credit, San Francisco Office, Expires May 2013 [Member] | Letter of Credit [Member]
Components of short-term borrowings and other debt
Letter of credit, borrowing capacity	82,000				82,000
Letter of Credit, Expires September 2013 [Member] | Letter of Credit [Member]
Components of short-term borrowings and other debt
Letter of credit, borrowing capacity	1,200,000				1,200,000
Letter of Credit, Expires December 2012 [Member] | Letter of Credit [Member]
Components of short-term borrowings and other debt
Letter of credit, borrowing capacity	6,700,000				6,700,000
Letter of Credit, Expires February 2013 [Member] | Letter of Credit [Member]
Components of short-term borrowings and other debt
Letter of credit, borrowing capacity	$ 1,000,000				$ 1,000,000

[1] Amount necessary to reduce net minimum lease payments to present value calculated at the Company's implicit rate at lease inception.