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Financial Statement Components
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Financial Statement Components Financial Statement Components
Cash and Cash Equivalents
Cash and cash equivalents consisted of the following (in thousands):
 March 31, 2021December 31, 2020
Cash$21,440 $10,652 
Money market funds19,035 64,971 
U.S. Treasury— 24,999 
Commercial paper166,255 108,322 
Total cash and cash equivalents$206,730 $208,944 
Inventories, net
Inventories consisted of the following (in thousands):
 March 31, 2021December 31, 2020
Raw materials$1,805 $625 
Work-in-process520 52 
Finished goods958 2,936 
Total inventories, net$3,283 $3,613 
The Company’s inventory write-down for the three months ended March 31, 2021 and 2020 were $0.3 million and $0.2 million, respectively.
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
 March 31, 2021December 31, 2020
Prepaid expenses$8,012 $1,073 
Contract assets1,221 — 
Advance payments to vendors196 961 
Prepaid rent and other— 503 
Other receivables942 2,260 
Total prepaid expenses and other current assets$10,371 $4,797 
Property and Equipment
Property and equipment consisted of the following (in thousands):
 March 31, 2021December 31, 2020
Computer hardware and software$2,559 $2,450 
Demonstration fleet and demonstration units1,669 1,821 
Machinery and equipment6,596 5,940 
Furniture and fixtures293 293 
Vehicles856 835 
Leasehold improvements960 791 
Construction in progress1,841 1,410 
Total property and equipment14,774 13,540 
Accumulated depreciation and amortization(6,408)(5,851)
Total property and equipment, net$8,366 $7,689 
Depreciation and amortization associated with property and equipment was $0.7 million and $0.6 million for the three months ended March 31, 2021 and 2020, respectively.
Property and equipment capitalized under finance lease (capital lease prior to adoption of ASC 842) consisted of the following (in thousands):
March 31, 2021December 31, 2020
Computer hardware and software$88 $88 
Machinery and equipment838838
Total property and equipment, gross926926
Less: accumulated depreciation(261)(219)
Total property and equipment, net$665 $707 
Other Non-Current Assets
Other non-current assets consisted of the following (in thousands):
 March 31, 2021December 31, 2020
Security deposits$1,072 $1,106 
Other non-current assets1,397 45 
Total other non-current assets$2,469 $1,151 
Accrued and Other Current Liabilities
Accrued and other current liabilities consisted of the following (in thousands): 
 March 31, 2021December 31, 2020
Accrued expenses$3,654 $3,998 
Warranty liabilities283 259 
Contract liabilities654 2,284 
Accrued compensation and benefits3,595 3,071 
Contract losses452 558 
Finance lease (capital lease prior to adoption of ASC 842) liabilities, current281 282 
Total accrued and other current liabilities$8,919 $10,452 
Other Non-Current Liabilities
Other non-current liabilities consisted of the following (in thousands): 
 March 31, 2021December 31, 2020
Deferred rent$— $826 
Finance lease (capital lease prior to adoption of ASC 842) liabilities, non-current263 331 
Other non-current liabilities973 161 
Total other non-current liabilities$1,236 $1,318 
 Financial Statement Components
Cash and Cash Equivalents
Cash and cash equivalents consisted of the following (in thousands):
 December 31,
 20202019
Cash$10,652 $5,676 
Money market funds64,971 2,260 
U.S. Treasury24,999 — 
U.S. agency securities— 1,398 
Commercial paper108,322 16,971 
Corporate bonds— 775 
Total cash and cash equivalents$208,944 $27,080 
Inventories
Inventories consisted of the following (in thousands):
 December 31,
 20202019
Raw materials$625 $1,998 
Work-in-process52 1,376 
Finished goods2,936 628 
Total inventories, net$3,613 $4,002 
The Company recorded inventory write-downs of $4.4 million and $1.4 million during the years ended December 31, 2020 and 2019, respectively.
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
 December 31,
 20202019
Prepaid expenses$1,073 $817 
Advance payments to vendors961 666 
Prepaid rent and other503 12 
Other receivables2,260 329 
Total prepaid expenses and other current assets$4,797 $1,824 
Property and Equipment
Property and equipment consisted of the following (in thousands):
 December 31,
 20202019
Computer hardware and software$2,450 $2,992 
Demonstration fleet and demonstration units1,821 1,603 
Machinery and equipment5,940 5,321 
Furniture and fixtures293 325 
Vehicles835 902 
Leasehold improvements791 821 
Construction in progress1,410 465 
Total property and equipment13,540 12,429 
Accumulated depreciation and amortization(5,851)(4,562)
Total property and equipment, net$7,689 $7,867 
Depreciation and amortization associated with property and equipment was $2.5 million and $2.3 million for the years ended December 31, 2020 and 2019, respectively.
Property and equipment capitalized under capital lease obligations consisted of the following (in thousands):
December 31,
20202019
Computer hardware and software$88 $88 
Machinery and equipment838 491 
Total property and equipment capitalized under capital lease obligations926 579 
Less: accumulated depreciation and amortization(219)(71)
Total$707 $508 
Goodwill
The carrying amount of goodwill allocated to the Company’s reportable segments was as follows (in thousands):
 Autonomy SolutionsOther Component
Sales		Total
As of December 31, 2020$687 $14 $701 
As of December 31, 2019$687 $14 $701 
Other Non-Current Assets
Other non-current assets consisted of the following (in thousands):
 December 31,
 20202019
Security deposits$1,106 $1,793 
Other non-current assets45 36 
Total other non-current assets$1,151 $1,829 
Accrued and Other Current Liabilities
Accrued and other current liabilities consisted of the following (in thousands): 
 December 31,
 20202019
Accrued expenses$3,998 $2,049 
Warranty liabilities259 267 
Contract liabilities2,284 225 
Accrued compensation and benefits3,071 823 
Contract losses558 — 
Capital lease liabilities and other, current282 162 
Total accrued and other current liabilities$10,452 $3,526 
Other Non-Current Liabilities
Other non-current liabilities consisted of the following (in thousands): 
 December 31,
 20202019
Deferred rent$826 $1,106 
Capital lease liabilities, non-current492 295 
Total other non-current liabilities$1,318 $1,401