Organization and Summary of Significant Accounting Policies - Summary of Allowance for Credit Losses by Asset Type (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Accounts receivable and unbilled receivables	$ 3,839	$ 3,227
Long-term unbilled receivables	30	0
Net investment in sales-type leases	$ 269	$ 225