| CASH FLOWS FROM OPERATING ACTIVITIES: |
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Net loss
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| Adjustments to reconcile net loss to net cash used in operating activities: |
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Depreciation expense
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Stock-based compensation expense
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| Amortization of right-of-use asset |
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| Impairment of property and equipment |
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| Non-cash interest expense for finance lease |
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| Non-cash interest expense for note payable |
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| Loss on disposal of property and equipment |
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| Issuance of warrants for service |
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| Gain on forgiveness of note payable, Paycheck Protection Program |
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| Non-cash interest expense |
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| Gain on revaluation of derivative warrant liability |
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Inventory
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| Prepaid expenses and other current assets |
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| Write-off and impairment of property and equipment |
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| Changes in operating assets and liabilities: |
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| Prepaid expenses and other current assets |
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| Deferred offering costs |
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| Other non-current assets |
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Accounts payable
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| Accrued expenses |
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| Due to related party |
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| Accrued expenses and other current and non-current liabilities |
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Net cash used in operating activities
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| CASH FLOWS FROM INVESTING ACTIVITIES: |
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Purchase of property and equipment
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Net cash used in investing activities
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| CASH FLOWS FROM FINANCING ACTIVITIES: |
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Proceeds from issuance of common stock, gross
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| Payment for issuance costs of common stock |
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| Proceeds from issuance of notes payable |
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| Repayment of notes payable |
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| Payments of convertible debenture issuance costs |
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| Proceeds from initial public offering, net of offering costs |
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| Proceeds from issuance of convertible debentures |
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| Payments on note payable, Paycheck Protection Program |
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| Payments of deferred offering costs |
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| Fractional shares adjustment for reverse stock split |
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| Payment of deferred offering costs |
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| Proceeds from exercise of stock options |
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| Payment of finance lease |
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Net cash provided by financing activities
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(Decrease) increase in cash and cash equivalents
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| Cash and cash equivalents, beginning of year |
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| Cash and cash equivalents, end of year |
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| Interest paid |
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| Accretion of Series redeemable, convertible preferred stock dividend |
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| Series A Redeemable, Convertible Preferred Stock |
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| Series B redeemable, convertible preferred stock |
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| Series C redeemable, convertible preferred stock |
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| Accretion of Series redeemable, convertible preferred stock issuance costs |
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| Series A Redeemable, Convertible Preferred Stock |
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| Series B redeemable, convertible preferred stock |
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| Series C redeemable, convertible preferred stock |
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| Exercise of warrants through debt principal conversion |
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| Conversion of convertible debentures into preferred stock |
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| Conversion of preferred stock into common stock |
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| Conversion of amended 2017 convertible notes |
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| Reclassification of derivative warrant liability into additional paid-in capital |
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| Fair value of warrants issued to placement agent in relation to the Convertible debentures |
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| Fair value of warrants for common stock issued for services |
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| Fair value of warrants issued to underwriters |
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| Net increase in cash and cash equivalents |
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| Cash and cash equivalents, beginning of period |
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| Cash and cash equivalents, end of period |
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| Cash paid for interest on finance lease |
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| Purchases of property and equipment included in accrued expenses |
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| Accretion of Series A redeemable, convertible preferred stock issuance costs and fair value adjustment |
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| Fair value of common stock issued in connection with notes payable |
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| SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION AND NON-CASH INVESTING ACTIVITIES |
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| Fair value of common stock issued in connection with notes payable |
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