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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities: |  |
Net income (loss) including noncontrolling interests in subsidiaries | $ 68,930 | $ (110,939)
Adjustments to reconcile net income (loss) including noncontrolling interests in subsidiaries to net cash used in operating activities: |  |
Depreciation, depletion and amortization | 14,728 | 13,514
Amortization of debt discount and issuance costs | 0 | 90
Change in fair value of Series A redeemable convertible preferred stock embedded derivatives | (3,954) | (1,613)
Change in fair value of Series A warrants | 0 | (1,895)
Change in fair value of Series B warrants | (2,762) | (11,598)
Loss on exercise of Series A warrants | 0 | 2,004
Gain on exercise of Series B warrants | (1,525) | 0
Compensation expense for share-based awards | 3,297 | 3,820
(Gain) loss on foreign currency exchange | (53) | 3,324
Change in fair value of equity securities | (31,423) | 263,695
Loss (gain) on sale of equity securities | 10,930 | (125,318)
Earnings on equity investment in joint venture | (4,167) | (42,531)
Unrealized gain on derivatives | (781) | 0
Deferred income taxes | (3,657) | (17,810)
Changes in assets and liabilities: |  |
Accounts receivable | (70,313) | 998
Inventories | 3,301 | (5,291)
Prepaid expenses and other assets | (820) | (5,986)
Accounts payable and accrued expenses | (4,651) | (136)
Royalties and contingent legal fees payable | 751 | (1,764)
Deferred revenue | (337) | 100
Net cash used in operating activities | (22,506) | (37,336)
Cash flows from investing activities: |  |
Acquisition, net of cash acquired (Note 3) | (9,409) | 0
Cash reinvested | 9,965 | 0
Patent acquisition | (6,000) | (5,000)
Purchases of equity securities | (13,072) | (112,142)
Sales of equity securities | 32,106 | 273,934
Distributions received from equity investment in joint venture | 2,777 | 28,404
Purchases of property and equipment | (189) | (732)
Net cash provided by investing activities | 16,178 | 184,464
Cash flows from financing activities: |  |
Repurchase of common stock | 0 | (50,988)
Paydown of Revolving Credit Facility | (7,700) | 0
Paydown of Senior Secured Notes | (60,000) | (120,000)
Dividend on Series A Redeemable Convertible Preferred Stock | (1,400) | (2,799)
Taxes paid related to net share settlement of share-based awards | (614) | (1,600)
Proceeds from exercise of stock options | 235 | 0
Net cash provided by (used in) financing activities | 58,632 | (166,137)
Effect of exchange rates on cash and cash equivalents | 1 | (2,566)
Increase (decrease) in cash and cash equivalents | 52,305 | (21,575)
Cash and cash equivalents, beginning | 287,786 | 309,361
Cash and cash equivalents, ending | 340,091 | 287,786
Supplemental schedule of cash flow information: |  |
Interest paid | 2,513 | 7,229
Income taxes paid | 831 | 384
Noncash investing and financing activities: |  |
Accrued patent costs | 4,000 | 9,000
Distribution to noncontrolling interests in subsidiaries | 1,390 | 14,126
Series A warrants |  |
Cash flows from financing activities: |  |
Proceeds from Warrant Exercises | 0 | 9,250
Series B |  |
Cash flows from financing activities: |  |
Proceeds from Warrant Exercises | 49,000 | 0
Rights Offering |  |
Cash flows from financing activities: |  |
Proceeds from Warrant Exercises | $ 79,111 | $ 0

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- Definition Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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