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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Operating activities |  |  |  |  |
Net income (loss) |  |  | $ 47,319 | $ (4,419) |
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |  |  |
Amortization expense | $ 34,515 | $ 37,463 | 69,032 | 74,929 |
Depreciation expense |  |  | 1,869 | 1,712 |
Deferred income taxes |  |  | (7,925) | (682) |
Stock-based compensation expense |  |  | 17,487 | 13,107 |
Non-cash lease benefit |  |  | (44) | (213) |
Non-cash interest expense for amortization of debt discount and issuance costs |  |  | 3,384 | 4,548 |
Loss on extinguishment of debt | 7,184 |  | 7,184 | 23,504 |
Net amortization of premiums and discounts on investments |  |  | (1,138) | (98) |
Changes in operating assets and liabilities: |  |  |  |  |
Accounts receivable |  |  | (4,330) | 15,640 |
Inventory |  |  | 4,470 | 20,475 |
Prepaid expenses and other assets |  |  | (11,688) | (1,749) |
Accounts payable |  |  | (6,144) | (1,075) |
Accrued liabilities |  |  | 982 | (884) |
Accrued rebates, returns and discounts |  |  | 8,877 | (17,402) |
Net cash provided by operating activities |  |  | 129,335 | 127,393 |
Investing activities |  |  |  |  |
Purchases of property and equipment |  |  | (838) | (232) |
Purchases of marketable securities |  |  | (73,403) | (41,661) |
Maturities of marketable securities |  |  | 47,207 |  |
Net cash used in investing activities |  |  | (27,034) | (41,893) |
Financing activities |  |  |  |  |
Proceeds from issuances of common stock from employee stock purchase plan |  |  | 356 | 169 |
Proceeds from the exercise of stock options |  |  | 9,924 | 5,099 |
Payments made for employee stock tax withholdings |  |  | (18,749) | (7,956) |
Repurchases of common stock, including the ASR agreement |  |  | (35,000) |  |
Repayment of term notes |  |  | (91,667) | (70,833) |
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) |
Redemption of 2026 Convertible Notes, including premium and redemption costs |  |  | (33,218) |  |
Net cash (used in) provided by financing activities |  |  | (168,354) | 23,061 |
Net (decrease) increase in cash, cash equivalents and restricted cash |  |  | (66,053) | 108,561 |
Cash, cash equivalents and restricted cash at beginning of period |  |  | 239,994 | 176,235 | $ 176,235
Cash, cash equivalents and restricted cash at end of period | 173,941 | 284,796 | 173,941 | 284,796 | 239,994
Reconciliation of cash, cash equivalents and restricted cash to the Condensed Consolidated Balance Sheets: |  |  |  |  |
Cash and cash equivalents | 172,894 | 283,749 | 172,894 | 283,749 | 238,947
Restricted cash | 1,047 | 1,047 | 1,047 | 1,047 | 1,047
Total cash, cash equivalents and restricted cash | $ 173,941 | $ 284,796 | 173,941 | 284,796 | $ 239,994
Supplemental disclosure of cash flow information |  |  |  |  |
Cash paid for interest |  |  | 29,542 | 37,187 |
Cash paid for income taxes |  |  | 35,881 | $ 10,011 |
Supplemental disclosure of non-cash activities |  |  |  |  |
Acquisition of property and equipment in accounts payable and accrued liabilities |  |  | 200 |  |
Miscellaneous costs of redemption of 2026 Convertible Notes |  |  | $ 27 |  |

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