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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Operating activities |  |  |
Net income (loss) | $ 27,713 | $ (17,426) |
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Amortization expense | 34,517 | 37,466 |
Depreciation expense | 917 | 817 |
Deferred income taxes | (4,412) | (46) |
Stock-based compensation expense | 7,475 | 6,035 |
Non-cash lease benefit | (22) | (105) |
Non-cash interest expense for amortization of debt discount and issuance costs | 1,780 | 2,287 |
Loss on extinguishment of debt |  | 23,504 |
Net amortization of premiums and discounts on investments | (415) |  |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 4,832 | 3,993 |
Inventory | 1,056 | 13,606 |
Prepaid expenses and other assets | (177) | (238) |
Accounts payable | (2,536) | (502) |
Accrued liabilities | 660 | (12,131) |
Accrued rebates, returns and discounts | (9,451) | (29,589) |
Net cash provided by operating activities | 61,937 | 27,671 |
Investing activities |  |  |
Purchases of property and equipment | (568) | (176) |
Purchases of marketable securities | (39,110) |  |
Maturities of marketable securities | 21,550 |  |
Net cash used in investing activities | (18,128) | (176) |
Financing activities |  |  |
Proceeds from issuances of common stock from employee stock purchase plan | 356 | 169 |
Proceeds from the exercise of stock options | 4,205 | 3,848 |
Payments made for employee stock tax withholdings | (12,874) | (7,736) |
Repayment of term notes | (45,833) | (25,000) |
Proceeds from issuances of 2029 Convertible Notes, net of issuance costs of $5,846 |  | 235,654 |
Repurchase of 2026 Convertible Notes, including premium |  | (138,638) |
Net cash (used in) provided by financing activities | (54,146) | 68,297 |
Net (decrease) increase in cash, cash equivalents and restricted cash | (10,337) | 95,792 |
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 | 229,657 | 272,027 | 239,994
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets: |  |  |
Cash and cash equivalents | 228,610 | 269,480 | 238,947
Restricted cash | 1,047 | 2,547 | 1,047
Total cash, cash equivalents and restricted cash | 229,657 | 272,027 | $ 239,994
Supplemental disclosure of cash flow information |  |  |
Cash paid for interest | 17,468 | 19,499 |
Cash paid for income taxes | $ 173 | 743 |
Supplemental disclosure of non-cash activities |  |  |
Note issuance costs in accounts payable and accrued liabilities |  | $ 434 |

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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