Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2022

Accounting Policies [Abstract]

Schedule of reconciliation of cash, cash equivalents, and restricted cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash in the condensed consolidated balance sheets to the total amount shown in the condensed consolidated statements of cash flows:

	As of
	June 30, 2022		December 31, 2021
Cash and cash equivalents	$	322,371	$	351,676
Restricted cash	150		150
Total cash, cash equivalents, and restricted cash	$	322,521	$	351,826

Property and equipment, schedule of useful lives

Depreciation is calculated using the straight-line method, based upon the following estimated useful lives:

Property and equipment, net, continued:

Equipment	5 years
Furniture and fixtures	3 years
Computer and related equipment	2 years
Software	2 years
Vehicles	5 years
Leasehold improvements	Lesser of useful life of the asset or remaining life of the lease

Schedule of accrued warranty liability

The following is a roll-forward of the Company’s accrued warranty liability:

	For the Six Months Ended June 30, 2022		For the Year Ended December 31, 2021
Balance at the beginning of the period	$	2,547	$	1,735
Acquisition date accrual for World Energy acquisition	—		25
Accrual for warranties issued	35		346
Accrual of additional warranty obligations	—		965
Warranty fulfillment charges	(256)		(524)
Balance at the end of the period	$	2,326	$	2,547

Schedule of fair values private warrants were valued using a black-scholes model

The fair value of stock options issued for the six months ended June 30, 2022 and 2021 was measured with the following assumptions:

	For the Six Months Ended June 30,
	2022	2021
Expected volatility	86.0% – 86.4%	78.0% – 87.1%
Expected term (in years)	6.25	6.25
Risk-free interest rate	1.4% – 1.7%	0.1%
Expected dividend yield	0.0%	0.0%

The Private Warrants were valued using a Black-Scholes model, pursuant to the inputs provided in the table below:

Input	Mark-to-Market Measurement at June 30, 2022			Mark-to-Market Measurement at December 31, 2021
Risk-free rate	3.00		%	1.11		%
Remaining term in years	3.48			3.98
Expected volatility	91.4		%	88.8		%
Exercise price	$	11.50		$	11.50
Fair value of common stock	$	1.15		$	3.31