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Balance Sheet Components - Accrued Liabilities and Other (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued Liabilities and Other    
Accrued compensation and related expenses $ 4,717 $ 7,274
Accrued litigation expense 3,200 3,200
Accrued professional services 571 392
Others 796 739
Accrued liabilities and other $ 9,284 $ 11,605