Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2022

Summary of Significant Accounting Policies

Concentrations of credit risk

	Three months ended March 31,
	2022				2021
		Net Sales	% of Net Revenues			Net Sales	% of Net Revenues
Customer A	$	1,965	36	%	$	—	—	%
Customer B		1,478	27	%		—	—	%
Customer C		720	13	%		—	—	%
Customer D		—	—	%		2,068	45	%
Customer E		—	—	%		528	11	%
Customer F		—	—	%		491	11	%
Total of customers with sales greater than 10%	$	4,163	76	%	$	3,087	67	%
Total of customers with sales less than 10%		1,249	24	%		1,504	33	%
Total Revenues	$	5,412	100	%	$	4,591	100	%

Schedule of allowance for doubtful accounts activity

	Three months ended March 31,
	2022		2021
Balance at beginning of period	$	3,349	$	—
Charges to expense		48		142
Deductions		—		—
Balance at end of period	$	3,397	$	142

Schedule of estimated useful lives of our major classes of property and equipment

Major class of property and equipment	Useful Lives
Machinery and equipment	7 years
Vehicles	5 years
Leasehold improvements	5 years
Computer equipment	3 years
Software	3 years
Furniture and fixtures	7 years

Schedule of disaggregates revenue by major source

	Three months ended March 31,
	2022		2021
Zero-emission vehicles	$	5,179	$	4,146
Other		233		445
	$	5,412	$	4,591

Schedule of changes in contract liabilities

Balance as of December 31, 2021	$	147
Revenues recognized		(38)
Increase due to billings		230
Balance as of March 31, 2022	$	339

Schedule of fair value hierarchy

	Level 1		Level 2		Level 3
As of March 31, 2022
Financial assets
Cash equivalents	$	147,545	$	—	$	—
Financial Liabilities
Warrant liability	$	—	$	—	$	1,997
Derivative liability	$	—	$	—	$	14,863
Earnout liability	$	—	$	—	$	76,972
As of December 31, 2021
Financial assets
Cash equivalents	$	150,022	$	—	$	—
Financial Liabilities
Warrant liability	$	—	$	—	$	2,185
Derivative liability	$	—	$	—	$	17,418
Earnout liability	$	—	$	—	$	83,144

Schedule of Earnout Liability

		Level 3
Initial recognition May 6, 2021	$	78,961
Loss		4,183
Balance at December 31, 2021	$	83,144
Gain		(6,172)
Balance at March 31, 2022	$	76,972