Financial Statement Detail (Details 2) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Summary of other assets
Prepaid contract expense, long-term	$ 4,732,000	$ 3,598,000
Debt issuance costs	5,608,000	1,146,000
Long-term deferred commissions	3,620,000	3,909,000
Deposits	2,556,000	2,555,000
Other	300,000	1,786,000
Total other assets	16,816,000	12,994,000
Restricted cash balance	1,300,000	1,300,000
Summary of accrued liabilities
Salaries and benefits payable	20,752,000	23,365,000
Accrued stock-based compensation	5,360,000
Deferred rent, current portion	1,658,000	1,353,000
Accrued restructuring, current portion	1,576,000	3,142,000
Other	10,813,000	9,236,000
Total accrued liabilities	40,159,000	37,096,000
Summary of other long-term liabilities
Deferred rent	9,713,000	10,502,000
Long-term deferred tax liability	1,709,000	2,141,000
Other	488,000	496,000
Total other long-term liabilities	$ 11,910,000	$ 13,139,000