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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities |  |
Net (loss) income | $ (16,782) | $ 18,463
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |
Realized loss on marketable debt securities | (22) | 354
Depreciation and amortization | 6,277 | 4,718
Amortization of debt discount | 132 | 4
Amortization on right-of-use assets | 421 | 343
Gain on sales of assets | (23) | (127)
Stock-based compensation expense | 3,536 | 3,986
Change in fair value of investment securities | 0 | (174)
Accounts receivable allowances | 718 | (761)
Inventory valuation reserve | 0 | (78)
Credit loss expense, direct write-offs | 91 | 6,163
Changes in operating assets and liabilities: |  |
Accounts receivable | (68) | (4,498)
Inventory | 135 | 702
Prepaid expenses and other current assets | (376) | (617)
Deferred tax asset | (7,313) | 0
Other assets | 0 | (555)
Accounts payable and accrued expenses | 3,478 | (1,121)
Accrued diagnostic services | (695) | (881)
Accrued advertising and other allowances | (75) | (5)
Deferred revenue | (76) | 619
Deferred tax liability | (224) | (138)
Lease liabilities | (181) | (301)
Income taxes payable | (912) | 2,878
Other liabilities | 611 | (423)
Net cash (used in) provided by operating activities | (11,348) | 28,551
Cash flows from investing activities |  |
Business acquisitions, escrow received | 478 | 0
Business acquisitions, net of cash acquired | (2,904) | 0
Issuance of secured promissory note receivable | 0 | 0
Purchase of marketable securities | (3,819) | (6,777)
Proceeds from sales of marketable securities | 3,817 | 1,047
Proceeds from maturities of marketable securities | 4,168 | 7,120
Proceeds from dispositions of property and other assets, net | 46 | 452
Proceeds from promissory note | 0 | 0
Capital expenditures | (3,155) | (3,919)
Net cash used in investing activities | (1,369) | (2,077)
Cash flows from financing activities |  |
Proceeds from issuance of note payable | 10,524 | 0
Proceeds from exercise of warrants | 1,200 | 0
Repayment of common stock for payment of statutory taxes on cashless exercise of stock options | (5,379) | (7,474)
Repayment of note payable | 0 | (7,044)
Repurchases of common shares | (588) | (2,152)
Payment of dividends | 0 | (9,353)
Net cash provided by (used in) financing activities | 5,757 | (26,023)
(Decrease) increase in cash, cash equivalents and restricted cash | (6,960) | 451
Cash, cash equivalents and restricted cash, at the beginning of the year | 9,109 | 8,658
Cash, cash equivalents and restricted cash, at the end of the year | 2,149 | 9,109
Supplemental disclosures: |  |
Cash paid for income taxes | 3,000 | 1,696
Interest payment on the promissory notes | 932 | 763
Supplemental disclosure of non-cash investing and financing activities: |  |
Stock-based compensation included in the prepaid expense | 1,024 | 0
Issuance of common shares for debt conversion | 2,400 | 600
Net unrealized loss, investments in marketable securities | 1,520 | 1,294
Assets obtained in exchange for new finance lease obligations | 5,809 | 0
Issuance of warrants with unsecured promissory note | 398 | 0
Common stock issued in asset acquisition | $ 1,000 | $ 0

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