Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) Agency shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 shares
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 4,136,000	$ 4,432,000
Financing commitments	713,985
Cash proceeds from combined company	5,000,000
Accounts receivable	13,609	661,352
Allowance for Doubtful Trade Receivable, Current	$ 0	0
Number of Government Agencies | Agency	2
Notes Receivable	$ 833,588	834,491
Allowance for Notes Receivable, Current	808,588	471,000
Inventory, net	353,730	494,158
Inventory Valuation Reserves	0	0
Inventory Deposits	965,994	935,204
Unrecognized Tax Benefits	$ 0	$ 0
Stock options outstanding | shares	9,685,247	25,617,338	24,728,422
Stock warrants outstanding | shares	10,681,327	7,556,323	7,556,323
Impairment of Long-Lived Assets Held-for-use	$ 0	$ 0
Research and Development Expense	75,000	108,751
Property, Plant, and Equipment, Threshold for Capitalization of Purchases	$ 2,000
Property, Plant, and Equipment Other than Leasehold Improvements [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Property, Plant, and Equipment Other than Leasehold Improvements [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
California Government Agencies [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable	$ 15,000
Blue Bird Corporation [Member] | Electric Drivetrain [Member]
Summary Of Significant Accounting Policies [Line Items]
Amount to be received for each electric drivetrain ordered	5,000
Fair Value, Measurements, Recurring [Member]
Summary Of Significant Accounting Policies [Line Items]
Assets, fair value disclosure	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Financing Commitments Tranche One [Member]
Summary Of Significant Accounting Policies [Line Items]
Net proceeds from financing commitments		5,300,000
Financing commitments		$ 5,425,000
Financing Commitments Tranche Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Financing commitments	$ 17,250,000