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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 (loss) | $ 90,954 | $ (2,002) | $ 2,623
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 27,257 | 24,321 | 16,408
Stock-based compensation | 50,516 | 37,378 | 65,763
Inventory write-offs and write-downs | 6,198 | 3,445 | 2,818
Deferred taxes | (19,061) | 1,458 | (14,091)
Acquired in-process research and development | 18,215 | 0 | 0
Other | 2,338 | 1,274 | 2,692
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (266) | (69,857) | (21,344)
Inventories | (67,710) | (74,631) | (51,554)
Prepaid expenses and other current and non-current assets | (18,909) | (1,237) | (13,032)
Accounts payable | 1,097 | 13,385 | (1,565)
Accrued expenses and other non-current liabilities | 6,221 | 10,542 | 17,076
Proceeds from lease incentives | 483 | 263 | 3,708
Net cash provided by (used in) operating activities | 97,333 | (55,661) | 9,502
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Asset acquisition, net of cash acquired | (988) | 0 | 0
Cash acquired in a business combination | 0 | 0 | 2,919
Purchases of marketable investments | (81,940) | 0 | (126,794)
Proceeds from sales of marketable investments | 0 | 1,180 | 2,000
Proceeds from maturities of marketable investments | 82,565 | 72,908 | 121,720
Purchases of property and equipment | (15,213) | (19,298) | (21,180)
Other | (500) | 0 | (400)
Net cash (used in) provided by investing activities | (16,076) | 54,790 | (21,735)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from exercises of stock options | 5,517 | 7,786 | 4,664
Proceeds from issuance of stock under employee stock purchase plan | 14,896 | 13,766 | 13,705
Payment of employee taxes related to vested common and restricted stock | (2,074) | (8,042) | (15,832)
Payments of finance lease obligations | (1,981) | (1,751) | (1,451)
Other | (155) | (137) | (250)
Net cash provided by financing activities | 16,203 | 11,622 | 836
Effect of foreign exchange rate changes on cash and cash equivalents | 168 | (272) | 1,106
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 97,628 | 10,479 | (10,291)
CASH AND CASH EQUIVALENTS—Beginning of period | 69,858 | 59,379 | 69,670
CASH AND CASH EQUIVALENTS—End of period | 167,486 | 69,858 | 59,379
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: |  |  |
Cash paid for income taxes | 6,557 | 2,919 | 1,496
NONCASH INVESTING AND FINANCING ACTIVITIES: |  |  |
Right-of-use assets obtained in exchange for operating lease obligations | 9,339 | 72,279 | 101,510
Right-of-use assets obtained in exchange for finance lease obligations | 1,118 | 305 | 1,346
Purchase of property and equipment funded through accounts payable and accrued liabilities | 1,182 | 2,293 | 2,330
Shares |  |  |
NONCASH INVESTING AND FINANCING ACTIVITIES: |  |  |
Fair value of stock issued in connection with acquisition | 17,227 | 0 | 174,133
Stock Options |  |  |
NONCASH INVESTING AND FINANCING ACTIVITIES: |  |  |
Fair value of stock issued in connection with acquisition | $ 0 | $ 0 | $ 80,693

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