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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities    
Net loss $ (47,024,000) $ (25,588,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 457,000 418,000
Accretion of debt discount and amortization of debt issuance costs 531,000 421,000
Stock-based compensation expense 3,107,000 291,000
Provision for doubtful accounts receivable 149,000 188,000
Provision for excess and obsolete inventories 297,000 1,093,000
Amortization of right-of-use asset 448,000 414,000
Change in fair value of redeemable convertible preferred stock warrant 6,861,000 175,000
Loss on disposal of property and equipment (98,000) 121,000
Proceeds from Paycheck Protection Program loan (2,246,000)
Changes in operating assets and liabilities:    
Accounts receivable (3,707,000) (1,170,000)
Inventory (648,000) (1,106,000)
Prepaid expenses and other current assets (3,331,000) (421,000)
Other noncurrent assets 204,000 130,000
Accounts payable (319,000) (104,000)
Accrued compensation 569,000 634,000
Accrued and other current liabilities 211,000 2,368,000
Other noncurrent liabilities 279,000 758,000
Net cash used in operating activities (41,818,000) (23,624,000)
Cash flows from investing activities    
Purchases of property and equipment (656,000) (651,000)
Net cash used in investing activities (656,000) (651,000)
Cash flows from financing activities    
Proceeds from issuance of common stock upon initial public offering, net of underwriting discounts and commissions 256,680,000
Payment of other offering costs related to the initial public offering  
Debt issuance costs - third party (126,000)
Proceeds from the issuance of redeemable convertible preferred stock 30,150,000
Redeemable convertible preferred stock issuance cost (161,000)
Proceeds from exercise of common stock options 264,000 19,000
Net cash (used in) provided by financing activities 252,438,000 29,882,000
Net change in cash and cash equivalents 209,964,000 5,607,000
Cash and cash equivalents at beginning of period 61,511,000 21,237,000
Cash and cash equivalents at end of period 271,475,000 26,844,000
Supplemental disclosure of cash flow information    
Cash paid for interest 2,331,000 936,000
Supplemental noncash disclosure    
Acquisition of property and equipment included in accounts payable and accrued liabilities 83,000 123,000
Noncash investing and financing:    
Common Stock issued on conversion of convertible preferred stock 117,331,000
Common stock warrants issued on conversion of preferred stock warrants and the reclassification of the warrant liability $ 8,973,000