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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 $ (17,332) $ (9,896)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 2,709 2,473
Depreciation and amortization 1,539 1,441
Amortization of deferred costs 1,585 548
Non-cash operating lease expense 556  
Loss on write-off of property and equipment   158
Gain on forgiveness of PPP loan and other 0 (743)
Changes in operating assets and liabilities:    
Accounts receivable (424) 86
Inventories   17
Deferred costs (1,939) (2,003)
Prepaid expenses and other current assets (2,282) (70)
Accounts payable 517 (1,804)
Accrued and other current liabilities 1,155 574
Deferred revenue 516 1,203
Operating lease liabilities (482)  
Net cash used in operating activities (13,882) (8,016)
Cash flows from investing activities:    
Purchase of property, plant and equipment (1,481) (609)
Net cash used in investing activities (1,481) (609)
Cash flows from financing activities:    
Proceeds from issuance of common stock in connection with Business Combination and PIPE investment 77,884 0
Payment of transaction and issuance costs in connection with Business Combination and PIPE investment (6,946) 0
Payment of financing costs in connection with a stock purchase agreement (326) 0
Proceeds from exercise of stock options 44 1
Proceeds from exercise of warrants 2,465 0
Capital contributions from Amprius Holdings 505 20,111
Net cash provided by financing activities 73,626 20,112
Net increase in cash, cash equivalents and restricted cash 58,263 11,487
Cash, cash equivalents and restricted cash, beginning of year 11,489 2
Cash, cash equivalents and restricted cash, end of year 69,752 11,489
Components of cash, cash equivalents and restricted cash:    
Cash and cash equivalents 69,696 11,489
Restricted cash included in other assets 56 0
Total cash, cash equivalents and restricted cash 69,752 11,489
Supplemental disclosure of non-cash investing and financing information:    
Operating lease liabilities and right-of-use assets upon adoption of ASC 842 3,256 0
Unpaid purchases of property, plant and equipment 83 51
Unpaid financing costs in connection with a stock purchase agreement $ 263 $ 0