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v3.21.2

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities: |  |
Net loss | $ (12,271,269) | $ (17,187,281)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation | 2,540,593 | 2,490,551
Depreciation and amortization | 286,448 | 288,589
Amortization of marketable securities discount | 141,159 | 23,422
Gain on extinguishment of debt | (1,422,214) |
Gain on legal fee obligation settled with stock | (9,525) | 156,434
Net noncash lease expense | 56,151 | 273,070
Inventory reserve charge | 39,478 |
Other |  | 14,893
Changes in operating assets and liabilities: |  |
Accounts receivable, net | (59,232) | 320,186
Inventories | 270,805 | (15,922)
Prepaid expenses and other current assets | 703,257 | 561,248
Accounts payable | 171,835 | (1,631,839)
Accrued expenses and other current liabilities | 324,316 | (1,407,813)
Right of use operating leases | (78,622) |
Operating lease liabilities | 33,277 | (355,274)
Net cash used in operating activities | (9,273,543) | (16,469,736)
Cash flows from investing activities: |  |
Purchase of marketable securities | (5,082,730) | (22,166,376)
Proceeds from maturities of marketable securities | 22,300,000 | 10,500,000
Net cash provided by (used in) investing activities | 17,217,270 | (11,666,376)
Cash flows from financing activities: |  |
Shares issued net of related expenses | 25,685,232 | 17,139,563
Proceeds from note issued |  | 1,410,524
Net cash provided by financing activities | 25,685,232 | 18,550,087
Effect of changes in exchange rates on cash and cash equivalents | 124,112 | (145,312)
Net increase in cash and cash equivalents | 33,753,071 | (9,731,337)
Cash and cash equivalents – beginning of period | 4,241,937 | 13,563,791
Cash and cash equivalents – end of period | 37,995,008 | 3,832,454
Supplemental cash flows disclosures: |  |
Proceeds from sale of state net operating losses | 1,425,935 | 1,170,890
Interest paid | 4,649 | 9,366
Income taxes paid | 38,622 | 3,254
Supplemental schedule of noncash activity: |  |
2020 Accrued bonus awarded in equity | 399,997 |
Accounts payable paid through issuance of common stock | $ 1,000,000 | $ 1,548,702

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