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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Prepaid expenses $ 9,706 $ 7,982
Prepaid regulatory license fees 1,493 1,991
Prepaid insurance 1,181 1,492
Prepaid advertising 421 322
Other current assets 586 562
Total prepaid expenses and other current assets, net $ 13,387 $ 12,349