Balance Sheet Detail (Details 2) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Summary of other assets
Long-term deferred commissions	$ 3,909,000	$ 5,587,000
Deposits	2,555,000	2,697,000
Prepaid contract expense, long-term	6,530,000	7,643,000
Total other assets	12,994,000	15,927,000
Restricted cash balance	1,300,000	1,400,000
Summary of accrued liabilities
Salaries and benefits payable	23,365,000	26,299,000
Accrued restructuring, current portion	2,600,000	1,050,000
Other	11,131,000	12,680,000
Total accrued liabilities	37,096,000	40,029,000
Summary of other long-term liabilities
Deferred rent	10,502,000	10,631,000
Long-term deferred tax liability	2,141,000	2,930,000
Other	496,000	187,000
Total other long-term liabilities	13,139,000	13,748,000
Components of accumulated other comprehensive income
Accumulated net unrealized gain (loss) on marketable securities	(9,000)	(13,000)
Accumulated foreign currency translation adjustments	10,039,000	6,883,000
Accumulated other comprehensive income, net of taxes	$ 10,030,000	$ 6,870,000