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Consolidated Balance Sheet Details - Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]    
Prepaid royalty expense $ 2,000 $ 2,286
Debt acquisition costs 72 241
Deposits 556 305
Prepaid clinical trial costs 775 0
Total other assets $ 3,403 $ 2,832