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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net loss $ (77,969) $ (477,117)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,523 572
Non-cash lease expense 1,134 0
Stock-based compensation expense 11,889 7,922
Change in fair value of warrant liabilities (24,475) 37,584
Change in fair value of derivative liabilities 0 223,165
Change in earnout liabilities (1,313) 154,806
Other non-cash income and expenses, net (866) (868)
Changes in operating assets and liabilities:    
Accounts receivable (1,886) 0
Prepaid expenses and other assets (311) (4,673)
Accounts payable 1,464 886
Accrued and other current liabilities 6,789 2,211
Accrued product warranties 1,643 0
Deferred revenue 1,881 3,663
Operating lease liabilities (1,123) 0
Net cash used in operating activities (81,620) (51,849)
Cash flows from investing activities:    
Purchases of property and equipment (14,180) (2,767)
Purchases and maturities of short-term investments, net (103,704) 0
Net cash used in investing activities (117,884) (2,767)
Cash flows from financing activities:    
Borrowings on notes payable 0 20,000
Payments on notes payable (1,900) (21,067)
Repurchase of shares from employees for income tax withholding purposes (2,808) 0
Proceeds from contributions to Employee Stock Purchase Plan 492 0
Net cash contributions from Business Combination and PIPE Financing 0 258,730
Payments made towards offering costs 0 (7,895)
Proceeds from warrants exercised 165 10,995
Proceeds from exercise of Legacy ESS Series C-2 Redeemable Convertible Preferred Stock Issuance Rights and C-2 warrants upon Business Combination 0 15,559
Proceeds from sale of Legacy ESS Series C-2 Redeemable Convertible Preferred Stock, net of issuance costs 0 11,461
Other, net (22) 671
Net cash (used in) provided by financing activities (4,073) 288,454
Net change in cash, cash equivalents and restricted cash (203,577) 233,838
Cash, cash equivalents and restricted cash, beginning of period 240,232 6,394
Cash, cash equivalents and restricted cash, end of period 36,655 240,232
Supplemental disclosures of cash flow information:    
Cash paid for operating leases included in cash used in operating activities 1,625 0
Cash paid for interest 154 1,799
Non-cash investing and financing transactions:    
Purchase of property and equipment included in accounts payable and accrued and other current liabilities 1,358 526
Right-of-use operating lease assets obtained in exchange for lease obligations 4,534 0
Right-of-use finance lease assets obtained in exchange for lease obligations 123 0
Warrant vested under contracts with customers 46 0
Extinguishment of derivative liabilities upon sale of Legacy ESS Series C-2 redeemable convertible preferred stock, net of amount allocated to warrants 0 18,055
Extinguishment of warrant liabilities upon exercise of Legacy ESS Series B, Series C-1 and Series C-2 redeemable convertible preferred stock warrants 0 26,178
Assumption of accrued expenses upon Business Combination 0 75
Assumption of private and public warrant liabilities upon Business Combination 0 11,833
Assumption of earnout warrant liabilities upon Business Combination 0 502
Assumption of earnout liability upon Business Combination 0 109,507
Extinguishment of earnout liability upon achievement of earnout and issuance of shares 0 263,338
Extinguishment of derivative liability upon exercise of Legacy ESS Series C-2 Issuance Right and related Series C-2 warrant liability upon Business Combination 0 222,924
Extinguishment of public warrant liability upon exercise of warrants 0 4,143
Cash and cash equivalents 34,767 238,940
Restricted cash, current 1,213 1,217
Restricted cash, non-current 675 75
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 36,655 $ 240,232