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Certain Balance Sheet Accounts - Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Trade receivables, net $ 29,809 $ 22,654
Sublease and other receivables 122 164
Total accounts receivables, net 29,931 22,818
Chargeback and product return allowances $ 1,500 $ 400