Balance Sheet Accounts - Other Liabilities, Short-Term (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Balance Sheet Accounts - Other Liabilities, Short-Term [Abstract]
Contingent equity consideration	$ 482	$ 922
Deferred revenue	669	785
Cash payable for asset acquisitions	873	492
Other liabilities, short term	$ 2,024	$ 2,199