Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Details - Accrued Expenses (Detail)

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Balance Sheet Details - Accrued Expenses (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Supplemental Balance Sheet Disclosures [Abstract]      
Accrued technology license payments $ 3,000,000 $ 3,000,000 $ 2,996,000
Accrued professional fees 285,000 285,000 386,000
Accrued litigation costs(1) 1,812,000 1,812,000 586,000
Other 992,000 992,000 1,055,000
Total 6,089,000 6,089,000 5,023,000
Litigation Settlement, Amount $ 1,250,000 $ 1,250,000