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Balance Sheet Accounts - Other Liabilities, Short-Term (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Contingent equity consideration $ 0 $ 922
Deferred revenue 683 785
Cash payable for asset acquisitions 412 492
Other liabilities, short term $ 1,095 $ 2,199