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Balance Sheet Components
 12 Months Ended
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Components Balance Sheet Components
Property and Equipment, Net
Property and equipment, net consists of the following (in thousands):
December 31,
20222021
Equipment$63,656 $45,501 
Buildings21,384 — 
Leasehold improvements14,319 9,364 
Computer software10,920 8,410 
Molds and tooling10,298 8,052 
Land6,270 $— 
Vehicles and aircraft1,582 1,198 
Furniture and fixtures682 319 
Construction in-progress6,094 6,394 
Gross property and equipment135,205 79,238 
Accumulated depreciation and amortization(43,102)(26,083)
Property and equipment, net$92,103 $53,155 
On November 30, 2022, the Company purchased certain real property, improvements and other assets for $25.5 million (Note 5).
Depreciation and amortization expense of property and equipment for the years ended December 31, 2022 and 2021 was $18.4 million and $12.1 million, respectively. Vehicles and aircraft includes utility automobiles used at the Company's various facilities and purchased aircraft to support the Company's air operations and training.
Intangible Assets, Net
The intangible assets consist of the following (in thousands):
December 31,
20222021
Automation Platform Software$7,200 $7,200 
Multimodal Software Technology4,900 4,900 
System Simulation Software Technology4,600 4,600 
Other Intangibles5,328 1,655 
Gross intangible assets22,028 18,355 
Accumulated amortization(9,447)(3,843)
Intangible assets, net$12,581 $14,512 
Amortization expense related to intangible assets for the years ended December 31, 2022 and 2021 was $5.6 million and $3.8 million, respectively. As of December 31, 2022 the weighted-average amortization period of intangible assets was 2.32 years.
The following table presents the estimated future amortization expense of acquired amortizable intangible assets as of December 31, 2022 (in thousands):
Fiscal YearDecember 31, 2022
2023$6,033 
20244,382 
20252,166 
$12,581 
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consist of the following (in thousands):
December 31,
20222021
Prepaid equipment$4,525 $2,923 
Prepaid software5,522 4,494 
Prepaid taxes1,273 1,332 
Prepaid insurance7,702 8,031 
Other1,138 636 
Total$20,160 $17,416 
Other Non-Current Assets
Other non-current assets consist of the following (in thousands):
December 31,
20222021
Contractual agreements asset$59,611 $59,611 
Long-term prepaid insurance3,770 10,511 
Other non-current assets819 199 
Total$64,200 $70,321 
Accrued and other current liabilities
Accrued and other current liabilities consist of the following (in thousands):
December 31,
20222021
Vendor related accruals$7,508 $4,220 
Payroll accruals5,992 4,026 
Acquisition-related obligation accrual2,167 — 
Other accruals and current liabilities3,116 1,965 
Total$18,783 $10,211