Geographic Information and Concentrations (Details) - USD ($) $ in Thousands	3 Months Ended							12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 1,809	$ 2,713	$ 1,836	$ 1,213	$ 2,250	$ 3,013	$ 18	$ 7,571	$ 5,281	$ 2,607
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues								806		2,320
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues								$ 6,765	5,281	$ 287
HONG KONG
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues									1,500
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues									3,000
KKC | Japan | 2019 KKC Agreement and 2017 KKC agreement
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues									$ 800