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Financial Statement Components
 9 Months Ended
Sep. 30, 2021
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):
 September 30, 2021December 31, 2020
Cash$17,097 $10,652 
Money market funds65,032 64,971 
U.S. Treasury— 24,999 
Commercial paper47,194 108,322 
Total cash and cash equivalents$129,323 $208,944 
Inventories, net
Inventories consisted of the following (in thousands):
 September 30, 2021December 31, 2020
Raw materials$4,858 $625 
Work-in-process1,672 52 
Finished goods1,341 2,936 
Total inventories, net$7,871 $3,613 
The Company’s inventory write-down (primarily due to obsolescence, lower of cost or market assessment, and other adjustments) was $0.1 million and $1.6 million for the three and nine months ended September 30, 2021, respectively, and $1.9 million and $4.4 million for the three and nine months ended September 30, 2020, respectively.
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
 September 30, 2021December 31, 2020
Prepaid expenses$4,723 $1,073 
Contract assets11,788 — 
Advance payments to vendors3,443 961 
Prepaid rent and other receivables3,929 2,763 
Total prepaid expenses and other current assets$23,883 $4,797 
Property and Equipment
Property and equipment consisted of the following (in thousands):
 September 30, 2021December 31, 2020
Machinery and equipment$10,265 $5,940 
Computer hardware and software3,263 2,450 
Demonstration fleet and demonstration units1,709 1,821 
Leasehold improvements990 791 
Vehicles795 835 
Furniture and fixtures571 293 
Construction in progress3,127 1,410 
Total property and equipment20,720 13,540 
Accumulated depreciation and amortization(9,592)(5,851)
Total property and equipment, net$11,128 $7,689 
Property and equipment capitalized under finance lease (capital lease prior to adoption of ASC 842) consisted of the following (in thousands):
September 30, 2021December 31, 2020
Computer hardware and software$88 $88 
Machinery and equipment838838
Total property and equipment, gross926926
Less: accumulated depreciation(321)(219)
Total property and equipment, net$605 $707 
Depreciation and amortization expense associated with property and equipment was $0.7 million and $2.1 million for the three and nine months ended September 30, 2021, respectively, and $0.7 million and $1.9 million for the three and nine months ended September 30, 2020, respectively.
Other Non-Current Assets
Other non-current assets consisted of the following (in thousands):
 September 30, 2021December 31, 2020
Security deposits$1,101 $1,106 
Other non-current assets1,435 45 
Total other non-current assets$2,536 $1,151 
Accrued and Other Current Liabilities
Accrued and other current liabilities consisted of the following (in thousands): 
 September 30, 2021December 31, 2020
Accrued expenses$6,152 $3,998 
Warranty liabilities1,721 259 
Contract liabilities579 2,284 
Accrued compensation and benefits7,045 3,071 
Contract losses9 558 
Finance lease (capital lease prior to adoption of ASC 842) liabilities, current257 282 
Employee tax withholding2,788 — 
Total accrued and other current liabilities$18,551 $10,452 
Other Non-Current Liabilities
Other non-current liabilities consisted of the following (in thousands): 
 September 30, 2021December 31, 2020
Deferred rent$— $826 
Finance lease (capital lease prior to adoption of ASC 842) liabilities, non-current145 331 
Other non-current liabilities766 161 
Total other non-current liabilities$911 $1,318