Summary of Accounting Policies - Summary of Balances of Contract Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Summary Of Accounting Policies [Line Items]
Total contract liabilities	$ 771	$ 843
Less: long-term portion		5
Contract liabilities – current	771	838
Extended Service Contracts
Summary Of Accounting Policies [Line Items]
Total contract liabilities	251	271
Subscription Software Licenses
Summary Of Accounting Policies [Line Items]
Total contract liabilities	$ 520	$ 572