Segment Reporting - Geographic Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues, total	[1]	$ 38,754	$ 34,902
Greater China [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues, total		25,518	5,269
Western Europe [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues, total		1,369	4,557
Asia (excluding China) [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues, total		4,302	5,860
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues, total		3,699	12,965
Latin America [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues, total		53	1,527
Russia & the CIS [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues, total		1,886	1,566
Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues, total	[2]	(553)	931
Rest of the World [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues, total		$ 2,480	$ 2,227

[1] The Company’s largest customer represents 31.2% of total Revenues for the three months ended March 31, 2021 (2020 — 14.4%) and 15.9% of total Accounts Receivable as of March 31, 2021. No single customer comprises more than 10% of the Company’s total Accounts Receivable as of December 31, 2020.

[2] For the three months ended March 31, 2021, the amount attributable to Canada includes a $0.5 million reversal of previously recorded revenue and a corresponding reduction in the net investment in lease as a result of a lease modification entered into in the period.