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Condensed Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net Income (Loss) $ (25,783) $ (39,944)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 2,977 8,203
Depreciation and amortization 1,294 1,460
Non-cash lease expense 381 346
Non-cash interest expense 636 607
Amortization of premium on investments, net (402) (1,577)
Provision for inventories (74) 450
Allowance for credit losses 197 (1)
Loss on extinguishment of term loan 7,685 0
Changes in operating assets and liabilities:    
Accounts receivable (1,467) (3,497)
Inventories 3,691 (6,981)
Prepaid expenses and other assets (341) (400)
Accounts payable (2,772) 945
Accrued compensation and related benefits (8,579) (4,462)
Accrued expenses and other current liabilities (370) (1,367)
Accrued warranty liability (8) (512)
Deferred revenue 396 1,197
Operating lease liabilities (429) (379)
Accrued interest (2,695) 0
Net cash used in operating activities (25,663) (45,912)
Cash flows from investing activities:    
Purchases of property and equipment (123) (354)
Purchases of investment securities (96,331) (98,652)
Sales and maturities of investment securities 18,375 39,975
Net cash used in investing activities (78,079) (59,031)
Cash flows from financing activities:    
Proceeds from stock option exercises and ESPP purchases 408 2,086
Proceeds from issuance of term loans, net of issuance costs 98,270 66,524
Repayment of term loan and extinguishment costs (204,954) 0
Proceeds from issuance of Series A convertible preferred stock, net of issuance costs 161,932 0
Net cash provided by financing activities 55,656 68,610
Net decrease in cash, cash equivalents and restricted cash (48,086) (36,333)
Cash, cash equivalents and restricted cash as of beginning of period 127,343 71,838
Cash, cash equivalents and restricted cash as of end of period 79,257 35,505
Summary of cash, cash equivalents and restricted cash reported within the balance sheets:    
Cash and cash equivalents 75,928 32,176
Restricted cash 3,329 3,329
Total cash, cash equivalents and restricted cash 79,257 35,505
Supplemental cash flow disclosures:    
Cash paid for income taxes 108 256
Cash paid for interest 7,364 4,924
Cash paid for amounts included in the measurement of operating lease liabilities 429 379
Supplemental non-cash investing and financing activities:    
Capital expenditures included in accounts payable and accrued expenses 14 37
Transfer of inventories to property and equipment 0 93
Issuance costs included in accrued expenses 300 0
Fair value of common stock warrant $ 4,367 $ 0