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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (9,886) $ (9,102)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,247 726
Depreciation and amortization 1,017 416
Amortization of deferred costs 0 134
Non-cash operating lease expense 1,286 202
Changes in operating assets and liabilities:    
Accounts receivable (177) 131
Inventories (128) (345)
Deferred costs (148) (864)
Prepaid expenses and other current assets (719) 553
Other assets 9 0
Accounts payable 352 59
Accrued and other current liabilities (2,163) 1,120
Deferred revenue (191) 657
Operating lease liabilities (278) (179)
Net cash used in operating activities (9,779) (6,492)
Cash flows from investing activities:    
Purchase of property, plant and equipment (3,896) (1,140)
Net cash used in investing activities (3,896) (1,140)
Cash flows from financing activities:    
Payment of equity financing costs 0 (268)
Proceeds from exercise of stock options 28 2
Net cash provided by financing activities 8,159 2,123
Net decrease in cash, cash equivalents and restricted cash equivalents (5,516) (5,509)
Cash, cash equivalents and restricted cash equivalents, beginning of period 45,817 69,752
Cash, cash equivalents and restricted cash equivalents, end of period 40,301 64,243
Reconciliation of cash, cash equivalents and restricted cash equivalents shown on the condensed consolidated balance sheets:    
Cash and cash equivalents 39,045 64,187
Restricted cash equivalents 1,256 56
Total cash, cash equivalents and restricted cash equivalents 40,301 64,243
At Market Issuance Sales Agreement    
Cash flows from financing activities:    
Proceeds from issuance of common stock 8,131 0
Stock Purchase Agreement    
Cash flows from financing activities:    
Proceeds from issuance of common stock $ 0 $ 2,389

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