Revenue (Tables)

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

Summary of Disaggregated Revenue by Geographic Region

Total revenue based on the disaggregation criteria described above are as follows (in thousands):

	Three Months Ended March 31,
	2021					2020
	Revenue		% of Revenue			Revenue		% of Revenue
Revenue by primary geographical market:
North America	$	201		65	%	$	135		26	%
Europe		15		5	%		392		74	%
Asia		92		30	%		—		—
Total	$	308		100	%	$	527		100	%
Revenue by timing of recognition:
Recognized at a point in time	$	293		95	%	$	135		26	%
Recognized over time		15		5	%		392		74	%
Total	$	308		100	%	$	527		100	%