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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities |  |  |
Net income | $ 179,722 | $ 220,262 | $ 368,837
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred income taxes | 4,400 | 25,006 | 76,432
Amortization of capitalized fees and depreciation of property and equipment | 13,921 | 13,931 | 13,832
Amortization of acquired intangible assets | 21,784 | 5,581 | 0
Inventory fair value step-up adjustment included in cost of products sold | 27,164 | 10,023 | 0
Stock-based compensation | 5,837 | 7,347 | 2,017
Amortization of debt discount and issuance costs | 2,065 | 2,055 | 9,136
Changes in fair values of equity method investments, net | (77,392) | 161,749 | (84,392)
Changes in fair values of equity and long-term investments, net | (11,129) | (8,462) | (4,917)
Loss on extinguishment of debt | 0 | 20,662 | 0
Net gain on sale of TRC | 0 | (266,696) | 0
Other non-cash items | (517) | 3,402 | (259)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (5,053) | (3,525) | 0
Receivables from collaborative arrangements | (14,949) | 13,319 | (16,780)
Inventory | (12,004) | 280 | 0
Prepaid expenses | 7,929 | (21,350) | 203
Other assets | (2,965) | (3,341) | 0
Accounts payable | 3,778 | 92 | (39)
Accrued personnel-related expenses and other accrued liabilities | (1,498) | 11,913 | (257)
Accrued interest payable | (937) | 207 | 0
Deferred revenue | (817) | (755) | 0
Income tax payable | 1,725 | 10,026 | 0
Net cash provided by operating activities | 141,064 | 201,726 | 363,813
Cash flows from investing activities |  |  |
Purchases of equity method investments | 0 | (45,000) | (44,000)
Purchases of trading securities | (65,132) | 0 | (15,905)
Purchases of equity and long term investments | (1,218) | (13,725) | (6,373)
Purchases of equity investments managed by ISP Fund LP | (31,164) | (60,910) | (190,970)
Purchases of trading security managed by ISP Fund LP | 0 | (50,000) | 0
Sales of equity investments managed by ISP Fund LP | 72,500 | 24,281 | 21,440
Purchase and sales of other investments managed by ISP Fund LP, net | (41,336) | (23,371) | 279,530
Purchases of property and equipment | (411) | (67) | 0
Proceeds from sale of ownership interest in TRC, net | 0 | 248,191 | 0
Cash acquired through the consolidation of Entasis | 0 | 23,070 | 0
Cash paid for the acquisition of La Jolla, net of cash acquired | 0 | (159,103) | 0
Net cash provided by (used in) investing activities | (66,761) | (56,634) | 43,722
Cash flows from financing activities |  |  |
Distributions to noncontrolling interest | 0 | (69,811) | (59,457)
Purchase of Entasis noncontrolling interest | 0 | (43,910) | 0
Repurchase of common stock | (75,728) | (8,503) | (394,149)
Repurchase of shares to satisfy tax withholding | (77) | (82) | (60)
Proceeds from issuances of common stock, net | 170 | 370 | 1,169
Payment for repurchase of convertible subordinated notes due 2023 | (96,204) | (165,131) | 0
Purchases of capped call options associated with convertible senior notes due 2028 | 0 | (21,037) | 0
Proceeds from issuance of convertible senior notes due 2028, net of issuance costs | 0 | 252,536 | 0
Net cash used in financing activities | (171,839) | (55,568) | (452,497)
Net increase (decrease) in cash and cash equivalents | (97,536) | 89,524 | (44,962)
Cash and cash equivalents at beginning of period | 291,049 | 201,525 | 246,487
Cash and cash equivalents at end of period | 193,513 | 291,049 | 201,525
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | 11,381 | 11,736 | 9,933
Cash paid for income taxes | 0 | 53,855 | 0
Supplemental Disclosure of Non-cash Investing and Financing Activities: |  |  |
Accrued interest income added to long-term investments | 2,666 | 0 | 0
Adoption of ASU 2020-06 | $ 0 | $ (28,228) | $ 0

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