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Balance Sheet Details - Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]
Commissions and sales milestones	$ 5,920	$ 6,259
Payroll and payroll related	5,577	8,291
Litigation settlements	4,400	7,393
Accrued professional fees	2,203	2,342
Royalties	1,578	2,129
Restructuring and severance accruals	1,358	849
Accrued taxes	1,074	1,344
Accrued interest	999	946
Other	6,682	5,840
Total accrued expenses	$ 29,791	$ 35,393

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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