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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating activities |  |  |
Net income (loss) | $ 48,155 | $ (25,002) | $ 71,517
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Amortization and impairment expense | 145,760 | 136,255 | 67,181
Depreciation expense | 3,496 | 2,684 | 1,736
Deferred income taxes | (2,153) | (8,391) | (78,042)
Stock-based compensation expense | 27,136 | 22,874 | 24,255
Non-cash lease (benefit) expense | (280) | 238 | 18
Loss on extinguishment of debt | 23,504 |  |
Non-cash interest expense for amortization of debt discount and issuance costs | 8,635 | 8,285 | 3,406
Net amortization of premiums and discounts on investments | (1,235) |  |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 3,594 | (21,780) | (22,524)
Inventory | 14,169 | 48,274 | (2,296)
Prepaid expenses and other assets | 1,439 | (4,606) | (1,086)
Accounts payable | 5,061 | (707) | (5,827)
Accrued liabilities | 628 | (11,131) | 4,777
Accrued rebates, returns and discounts | (3,160) | (22,766) | 40,442
Operating lease assets and liabilities |  | 3 |
Net cash provided by operating activities | 274,749 | 124,230 | 103,557
Investing activities |  |  |
Purchases of property and equipment | (461) | (1,622) | (1,944)
Purchases of marketable securities | (92,351) |  |
Maturities of marketable securities | 22,000 |  |
Acquisition of BDSI (net of cash acquired) |  | (572,069) |
Net cash used in investing activities | (70,812) | (573,691) | (1,944)
Financing activities |  |  |
Proceeds from issuances of common stock from employee stock purchase plans | 460 | 337 | 755
Proceeds from the exercise of stock options | 8,641 | 11,811 | 11,952
Payments made for employee stock tax withholdings | (8,361) | (4,044) | (4,149)
Repurchases of common stock | (75,000) | (14,063) | (47,861)
Repayment of term notes | (162,500) | (75,000) | (50,000)
Proceeds from term note modification |  | 517,682 |
Proceeds from issuances of 2029 convertible notes, net of issuance costs of $6,280 | 235,220 |  |
Repurchase of 2026 Convertible Notes, including premium | (138,638) |  |
Net cash (used in) provided by financing activities | (140,178) | 436,723 | (89,303)
Net increase (decrease) in cash, cash equivalents and restricted cash | 63,759 | (12,738) | 12,310
Cash, cash equivalents and restricted cash at beginning of year | 176,235 | 188,973 | 176,663
Cash, cash equivalents and restricted cash at end of year | 239,994 | 176,235 | 188,973
Reconciliation of cash, cash equivalents and restricted cash to the Consolidated Balance Sheets: |  |  |
Cash and cash equivalents | 238,947 | 173,688 | 186,426
Restricted cash | 1,047 | 2,547 | 2,547
Total cash, cash equivalents and restricted cash | 239,994 | 176,235 | 188,973
Supplemental disclosure of cash flow information |  |  |
Cash paid for interest | 73,256 | 52,528 | 17,608
Cash paid for income taxes | 24,205 | $ 10,400 | 3,005
Supplemental disclosure of non-cash activities |  |  |
Acquisition of property and equipment in accounts payable and accrued liabilities | 176 |  | 72
Excise tax on share repurchases in accrued liabilities | $ 457 |  |
Inventory used in the construction and installation of property and equipment |  |  | $ 516

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