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Inventories - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
 [1]
Dec. 31, 2020
Inventories (Textuals) [Abstract]          
Finished goods inventory with title passed to customer $ 2,200   $ 2,200   $ 2,100
Write-downs for excess and obsolete inventory $ 300 $ 600 $ 468 [1] $ 729  
[1] In the nine months ended September 30, 2021, the Company recorded write-downs of $0.5 million (2020 — $0.7 million) in Costs and Expenses Applicable to Technology Sales related to excess and damaged inventory.