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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Operating activities: |  |
Net income (loss) | $ (3,858,415) | $ (3,275,800)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |
Stock based compensation | 440,856 | 505,188
Depreciation and amortization | 235,771 | 315,456
Amortization of right-of-use assets | 136,404 | 292,849
Provision (recovery) for accounts receivable allowances | (102,631) | 264,808
Provision for inventory reserves | 0 | 18,988
Non-cash loan forgiveness | (1,057,330) | 0
Changes in operating assets and liabilities: |  |
Accounts receivable | (4,969,826) | (1,574,778)
Inventories | (8,871,803) | 468,340
Prepaid expense and other current assets | (129,381) | 648,847
Other assets | (142,017) | 0
Accounts payable | 6,673,914 | 655,220
Accrued expenses | 4,686,050 | 462,244
Operating lease liabilities | (135,466) | (318,183)
Net cash provided by (used in) operating activities | (7,093,874) | (1,536,821)
Investing activities: |  |
Cash acquired from merger | 501,845 | 0
Purchases of equipment | (302,519) | (174,254)
Certification costs incurred and capitalized | (460,577) | (310,000)
Capitalized software costs | (316,838) | 0
Net cash provided by (used in) investing activities | (578,089) | (484,254)
Financing activities: |  |
Net proceeds from (payments to) bank credit lines | 2,442,246 | (1,741,272)
Proceeds from debt | 583,300 | 0
Net proceeds from private placement offering | 3,163,370 | 4,942,610
Proceeds from stock option exercise | 1,171,621 | 60,648
Proceeds from profit disgorgement | 196,000 | 0
Proceeds from non-recourse promissory notes issued by Minim option holders | 320,290 | 0
Net cash provided by (used in) financing activities | 7,876,827 | 3,261,986
Net change in cash and cash equivalents | 204,864 | 1,240,911
Cash, cash equivalents, and restricted cash - Beginning | 1,366,893 | 125,982
Cash, cash equivalents, and restricted cash - Ending | 1,571,757 | 1,366,893
Cash paid during the period for: |  |
Interest | 48,473 | 48,404
Income taxes | 26,716 | 31,769
Non-cash financing activities: |  |
Net share settlement from non-recourse promissory notes issued by Minim option holders | 230,332 | 0
Repurchase of Minim common stock | (14,860) | 0
Cash is reported on the consolidated statements of cash flows as follows: |  |
Cash and cash equivalents | 771,757 | 1,216,893
Restricted cash | 800,000 | 150,000
Total Cash and cash equivalents | $ 1,571,757 | $ 1,366,893

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