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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Operating activities |  |
Net income (loss) | $ 2,665 | $ (20,901)
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 2,259 | 2,113
Amortization of right-of-use assets | 1,668 | 1,335
Inventory write-off | 1,264 | 0
Sublease termination loss (Note 5) | 4,765 | 0
Accretion of discounts on marketable securities | (8,465) | (7,263)
Stock-based compensation expense | 26,532 | 20,596
Bad debt expense | 0 | 12,313
Non-cash interest expense | 574 | 556
Changes in operating assets and liabilities: |  |
Accounts and other receivables, net | (18,097) | 42,448
Inventories | (10,436) | 6,358
Prepaid expenses and other current assets | (6,290) | (3,172)
Other assets | (101) | 703
Accounts payable | (569) | (151)
Lease liabilities | (2,109) | (1,679)
Accrued and other liabilities | 374 | 2,412
Net cash (used in) provided by operating activities | (5,966) | 55,668
Investing activities |  |
Purchases of marketable securities | (326,121) | (259,531)
Proceeds from maturities and redemption of marketable securities | 301,713 | 233,953
Purchases of property and equipment, net | (1,528) | (2,034)
Net cash used in investing activities | (25,936) | (27,612)
Financing activities |  |
Proceeds from exercise of stock options | 2,054 | 1,617
Proceeds from Employee Stock Purchase Plan | 904 | 777
Payments for taxes related to net share settlement of restricted stock units | (8,576) | (5,778)
Net cash used in financing activities | (5,618) | (3,384)
Effect of exchange rate changes on cash and cash equivalents, and restricted cash | (265) | 150
Net (decrease) increase in cash and cash equivalents, and restricted cash | (37,785) | 24,822
Cash and cash equivalents, and restricted cash at beginning of period | 150,556 | 202,211
Cash and cash equivalents, and restricted cash at end of period | 112,771 | 227,033
Supplemental disclosure of cash flow information |  |
Cash paid during the period for income taxes | 2,963 | 710
Cash paid during the period for interest | 2,819 | 2,819
Reclassification of contract asset from other current assets to other assets | 0 | 71,307
Reclassification of CEPI accrual to CEPI accrual long-term | 0 | (60,337)
Advance Payments forgiven per CEPI-Bio E Assignment Agreement (Note 6) | 0 | (47,401)
Non-cash investing and financing activities: |  |
Purchases of property and equipment, not yet paid | 574 | 540
Right-of-use assets obtained in exchange of operating lease liabilities | $ 0 | $ 901

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