Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Cash and Cash Equivalents

Cash and cash equivalents consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Cash	$	35,891	$	58,754
Cash equivalents	132,014		14,941
Total cash and cash equivalents	$	167,905	$	73,695

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets to the total of such amounts shown on the statements of cash flows. The restricted cash is primarily collateral for performance bonds issued to certain customers. The collateral is provided in the form of a cash deposit to either support the bond directly or to collateralize a letter of credit that supports the performance bonds.

	March 31, 2023		December 31, 2022
Cash and cash equivalents	$	167,905	$	73,695
Restricted cash, current portion	12,565		12,565
Total cash and cash equivalents, and restricted cash	$	180,470	$	86,260

Cash and cash equivalents consisted of the following (in thousands):

	December 31,
	2022		2021
Cash	$	58,754	$	17,065
Cash equivalents	14,941		152,974
Total cash and cash equivalents	$	73,695	$	170,039

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets to the total of such amounts shown on the statements of cash flows. The restricted cash is primarily collateral for performance bonds issued to certain customers. The collateral is provided in the form of a cash deposit to either support the bond directly or to collateralize a letter of credit that supports the performance bonds.

	December 31,
	2022		2021
Cash and cash equivalents	$	73,695	$	170,039
Restricted cash, current portion	12,565		12,105
Restricted cash, net of current portion	—		460
Total restricted cash	12,565		12,565
Total cash and cash equivalents, and restricted cash	$	86,260	$	182,604

Inventories

Inventories consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Raw materials	$	163,327	$	127,199
Work in progress	22,419		21,153
Finished goods	11,123		13,518
Service parts	8,620		7,697
Total inventories	$	205,489	$	169,567

Inventories consisted of the following (in thousands):

	December 31,
	2022		2021
Raw materials	$	127,199	$	65,225
Work in progress	21,153		25,062
Finished goods	13,518		18,269
Service parts	7,697		6,000
Total inventories	$	169,567	$	114,556

Property, Plant and Equipment, Net

Property, plant, and equipment, net, consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Computer hardware	$	6,020	$	5,465
Computer software	12,813		11,012
Internally used vehicles and charging systems	15,177		15,177
Leased vehicles and batteries	5,142		5,142
Leasehold improvements	30,883		10,716
Machinery and equipment	54,195		28,942
Office furniture and equipment	3,282		2,523
Tooling	23,971		22,430
Finance lease right-of-use assets	878		179
Construction in progress	29,209		72,505
	181,570		174,091
Less: Accumulated depreciation and amortization	(71,145)		(66,539)
Total	$	110,425	$	107,552

Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets, as follows:

Property, Plant, and Equipment	Estimated Useful Life
Computer hardware	3 years
Computer software	3 to 5 years
Internally used vehicles and charging systems	over the shorter of their estimated useful lives or 5 years
Machinery and equipment	5 to 12 years
Office furniture and equipment	5 years
Tooling	3 to 5 years
Leasehold improvements	over the shorter of their estimated useful lives or the terms of the related leases
Leased batteries	over the shorter of the terms of the related leases or 12 years
Leased vehicles and charging systems	over the shorter of the terms of the related leases or 5 years

Property, plant, and equipment, net, consisted of the following (in thousands):

	December 31,
	2022		2021
Computer hardware	$	5,465	$	5,195
Computer software	11,012		9,561
Internally used vehicles and charging systems	15,177		16,459
Leased vehicles and batteries	5,142		6,863
Leasehold improvements	10,716		10,516
Machinery and equipment	28,942		28,302
Office furniture and equipment	2,523		1,861
Tooling	22,430		21,726
Finance lease right-of-use assets	179		179
Construction in progress	72,505		20,243
	174,091		120,905
Less: Accumulated depreciation and amortization	(66,539)		(58,659)
Total	$	107,552	$	62,246

Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Accrued payroll and related expenses	$	6,493	$	8,647
Accrued sales and use tax	1,284		1,784
Warranty reserve	8,229		8,406
Accrued supplier liability	4,059		7,699
Insurance related	1,764		4,445
Other accrued expenses	3,433		2,570
Total	$	25,262	$	33,551

Accrued liabilities consisted of the following (in thousands):

	December 31,
	2022		2021
Accrued payroll and related expenses	$	8,647	$	8,069
Accrued sales and use tax	1,784		885
Warranty reserve	8,406		8,116
Accrued supplier liability	7,699		—
Insurance related liability	4,445		—
Other accrued expenses	2,570		3,564
Total	$	33,551	$	20,634

Other Long-term Liabilities

Other long-term liabilities consisted of the following (in thousands):

	March 31, 2023		December 31, 2022
Warranty reserve	$	20,020	$	17,107
Finance lease liabilities, non-current	512		57
Total	$	20,532	$	17,164

Other long-term liabilities consisted of the following (in thousands):

	December 31,
	2022		2021
Warranty reserve	$	17,107	$	15,158
Finance lease liabilities, non-current	57		87
Total	$	17,164	$	15,245