| Cash Flow | 2026-03-31 | 2025-12-31 | 2025-09-30 | 2025-06-30 |
|---|---|---|---|---|
| Net loss | -15,922 | -23,983 | -10,375 | -29,082 |
| Depreciation and amortization | 2,379 | 1,169 | 1,486 | 3,085 |
| Asset abandonment | NaN | 1,707 | NaN | NaN |
| Non-cash interest expense (income) | 2,477 | 5,383 | -247 | -155 |
| Non-cash lease expense | 426 | 414 | 381 | 731 |
| Stock-based compensation expense | 1,064 | 1,489 | 1,246 | 2,699 |
| Change in fair value of common stock warrant liabilities | -344 | 115 | 0 | -344 |
| Other non-cash expenses, net | -2 | -196 | 7 | -199 |
| Accounts receivable, net | 24 | -94 | -22 | -86 |
| Inventory write-down and losses on noncancellable purchase commitments | NaN | NaN | NaN | -744 |
| Inventory | -17 | -4,513 | 705 | -1,025 |
| Prepaid expenses and other assets | -904 | 798 | -2,200 | -468 |
| Accounts payable | -1,732 | -4,195 | -915 | 1,268 |
| Accrued and other liabilities | -2,266 | 1,653 | -3,029 | -1,465 |
| Accrued product warranties | 0 | -1,213 | 0 | -1,090 |
| Deferred revenue | -13 | -13 | 3,799 | -6,458 |
| Operating lease liabilities | -427 | -385 | -433 | -820 |
| Net cash used in operating activities | -13,459 | -13,854 | -5,833 | -30,597 |
| Purchases of property and equipment | 930 | 2,313 | -417 | 1,491 |
| Maturities and purchases of short-term investments, net | -1,655 | 7,496 | 0 | -18,411 |
| Net cash provided by investing activities | 725 | -9,809 | 417 | 16,920 |
| Proceeds from issuance of common stock via atm, net of issuance costs | 1,412 | NaN | NaN | 721 |
| Proceeds from issuance of common stock and common stock warrants, net of commission fees | NaN | NaN | 4,789 | NaN |
| Proceeds from issuance of common stock and common stock warrants via rdo, net of issuance costs | 13,553 | 37,651 | NaN | NaN |
| Proceeds from financing arrangements | 9,200 | 23,028 | 4,000 | NaN |
| Debt issuance costs | NaN | 308 | NaN | NaN |
| Proceeds from contributions to employee stock purchase plan | NaN | 4 | 0 | 103 |
| Payments on financing obligations | 10,840 | 21,049 | NaN | NaN |
| Proceeds from stock options exercised | 0 | 78 | -1 | 6 |
| Repurchase of shares from employees for income tax withholding purposes | 0 | 14 | 9 | 27 |
| Net cash provided by (used in) financing activities | 14,046 | 34,601 | 8,058 | 803 |
| Net change in cash, cash equivalents and restricted cash | 1,312 | 10,938 | 2,642 | -12,874 |
| Cash, cash equivalents and restricted cash, beginning of period | 15,901 | 4,963 | 15,195 | NaN |
| Cash, cash equivalents and restricted cash, end of period | 17,213 | 15,901 | 4,963 | NaN |
ESS Tech, Inc. (GWH)
ESS Tech, Inc. (GWH)