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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities |  |
Net income (loss) | $ 6,273,000 | $ (2,125,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |
Realized (gain) loss on marketable debt securities | 165,000 | (2,000)
Gain on discontinued operations, net of taxes |  | (201,000)
Depreciation and amortization | 3,234,000 | 449,000
Amortization of debt discount | 5,000 | 1,000
Amortization on right-of-use assets | 329,000 | 9,000
Lower of cost or net realizable value inventory adjustment |  | 68,000
Consulting expense paid through reduction of secured promissory note receivable |  | 250,000
Impairment of secured promissory note receivable | 3,750,000 |
Stock-based compensation expense | 3,183,000 | 1,459,000
Change in fair value of investment securities | 240,000 |
Non-cash interest income on secured promissory note receivable | (316,000) |
Gain on sale of real estate |  | (1,892,000)
Accounts receivable allowances | 3,866,000 | 97,000
Inventory valuation reserve | 267,000 | (193,000)
Changes in operating assets and liabilities: |  |
Accounts receivable | (38,197,000) | (1,136,000)
Inventory | (1,746,000) | (1,275,000)
Prepaid and other assets | 1,445,000 | (3,005,000)
Other assets | (368,000) | (240,000)
Accounts payable and accrued expenses | 2,450,000 | 3,339,000
Accrued diagnostic services | 1,890,000 |
Deferred revenue | 2,608,000 |
Lease liabilities | 130,000 | (9,000)
Other liabilities | (2,827,000) | 1,814,000
Net cash used in operating activities | (13,619,000) | (2,592,000)
Cash flows from investing activities |  |
Business acquisitions, net of cash acquired | (9,066,000) |
Issuance of secured promissory note receivable | (1,000,000) | (3,000,000)
Purchase of marketable securities | (21,527,000) | (4,560,000)
Proceeds from sale of marketable debt securities | 15,858,000 | 3,840,000
Proceeds from promissory note | 300,000 |
Escrow receivable |  | 4,812,000
Acquisition of Confucius Labs |  | (2,500,000)
Proceeds from sale of building, net |  | 2,081,000
Capital expenditures | (4,231,000) | (1,689,000)
Net cash used in investing activities | (19,666,000) | (1,016,000)
Cash flows from financing activities |  |
Proceeds from issuance of common stock from public offering, net | 35,135,000 |
Proceeds from issuance of common stock and warrants from private offering | 5,500,000 |
Proceeds from unsecured convertible promissory notes |  | 10,000,000
Issuance costs on unsecured convertible promissory notes |  | (10,000)
Repayment of note payable | (45,000) |
Repurchases of common shares | (917,000) |
Payment of dividends | (4,546,000) |
Net cash provided by financing activities | 35,127,000 | 9,990,000
Increase in cash, cash equivalents and restricted cash | 1,842,000 | 6,382,000
Cash, cash equivalents and restricted cash, at the beginning of the year | 6,816,000 | 434,000
Cash, cash equivalents and restricted cash, at the end of the year | 8,658,000 | 6,816,000
Supplemental disclosures: |  |
Cash paid for income taxes |  |
Interest payment on the promissory notes | 1,000,000 | 250,000
Supplemental disclosure of non-cash investing and financing activities: |  |
Issuance of common shares related to business acqusition | 3,608,000 |
Right-of-use assets and lease liability recorded upon adoption of ASC 842 |  | 4,740,000
Net unrealized loss, investments in marketable debt securities | (164,000) | (9,000)
Recognize additional goodwill related to deferred tax liability | $ 362,000 |

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