Revenue From Contracts With Customers - Summary of Information about Receivables and Contract Liabilities from Contracts with Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule Of Contract Balances [Line Items]
Accounts receivable, current	$ 2,695	$ 2,012
Notes receivable, current	436	444
Notes receivable, long-term	275	452
Contract liability, current	1,071	923
Notes and Other Receivables, Long-Term, Net
Schedule Of Contract Balances [Line Items]
Notes receivable, long-term	275	452
Deferred Revenue
Schedule Of Contract Balances [Line Items]
Contract liability, current	1,071	923
Other Long-Term Liabilities
Schedule Of Contract Balances [Line Items]
Contract liability, non-current	$ 71	$ 128