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Balance Sheet Components - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accrued Liabilities    
Accrued compensation expenses $ 6,120 $ 4,212
Accrued Genzyme co-promotion fees 0 2,089
Accrued other 2,990 2,388
Total accrued liabilities $ 9,110 $ 8,689