Inventories - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019	[1]	Dec. 31, 2019
Inventories (Textuals) [Abstract]
Inventories increased			$ 10,000,000.0
Finished goods inventory with title passed to customer	$ 4,800,000		4,800,000				$ 700,000
Write-downs for excess and obsolete inventory	$ 600,000	$ 0	$ 729,000	[1]	$ 0

[1] In the nine months ended September 30, 2020, the Company recorded write-downs of $0.7 million (2019 — $nil) related to excess inventory