| Dec 31, 2013 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 |
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NET LOSS | 117,395 | -1,295,587 | -1,022,117 | -78,292 | -2,493,805 |
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Depreciation | 414,307 | 2 | 2 | 2 | 2 |
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Amortization of intangible assets | 2,894 | 19,104 | 19,104 | 19,104 | 19,104 |
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Amortization of debt issuance costs | - | 16,976 | 102,724 | 7,841 | 7,658 |
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Stock-based compensation | 31,359 | 313,144 | 253,135 | 144,313 | 266,244 |
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(Gain) loss on disposal of property, plant and equipment | -35,179 | -2,469 | -39,303 | -30,963 | 7,334 |
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Non-cash rent expense | - | - | -15,320 | -10,716 | -28,476 |
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Trade accounts receivable | - | 704,867 | 159,636 | 897,428 | -935,629 |
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Accrued interest income | - | 27,753 | -27,258 | -495 | - |
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Inventory | -442,494 | 186,585 | -425,742 | 997,460 | 3 |
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Prepaid expenses and other current assets | -45,917 | 73,749 | 61,695 | -26,064 | 110,858 |
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Other assets | - | 13,931 | -711 | -58 | 50,513 |
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Accounts payable and accrued expenses | - | -88,711 | 299,881 | 245,760 | 341,614 |
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Net cash (used for) provided by operating activities | - | 233,511 | 1 | 954,170 | -1,543,871 |
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Purchase of property, plant and equipment | 597,697 | 1 | 4 | 3 | 4 |
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Maturities of investment | - | - | -3,449,000 | -996,000 | - |
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Proceeds from sale of property, plant and equipment | - | - | 45,600 | 15,290 | 11,000 |
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Net cash used for investing activities | - | -3,403,360 | -2,569,939 | -1,597,359 | -3,964,274 |
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Proceeds from public offering, net | - | 8 | - | 4 | - |
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Proceeds from debt issuance | - | - | 12 | 400,000 | 2 |
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Debt principal repayments | 181,445 | 861,347 | 10 | 768,271 | 897,125 |
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(Payments) net adjustments of debt issuance costs | - | - | - | - | -19,306 |
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Proceeds from exercise of stock options | 21,750 | 3 | 9 | 11,693 | 30,670 |
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Net cash provided by financing activities | - | 7 | 2 | 4 | 1 |
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NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | - | - | 656,644 | 3 | -4,393,906 |
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Income taxes | - | 3,566 | 4,581 | 5,110 | 4,923 |
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Interest expense | - | 420,956 | 481,408 | 308,682 | 338,516 |
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Change in capital expenditures included in accounts payable and accrued expenses | 30,284 | 74,052 | -43,895 | - | 44,998 |
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Surrender of shares to exercise stock options | - | - | - | 165,337 | - |
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Lease liability arising from obtaining right-of-use asset | - | - | - | - | 1 |
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