Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 1,659	$ 2,927
Accrued employee compensation and related taxes.	3,495	4,529
Accrued expenses	1,884	1,591
Accrued license fees	74
Accrued legal	470	214
Accrued restructuring	139
Total	10,949	15,318
Leasehold Improvements
Accounts Payable and Accrued Liabilities [Line Items]
Accrued liabilities		2,472
Accrued sales allowances
Accounts Payable and Accrued Liabilities [Line Items]
Accrued liabilities	921	525
Other
Accounts Payable and Accrued Liabilities [Line Items]
Accrued liabilities	$ 2,307	$ 3,060