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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Operating activities |  |
Net income (loss) | $ (8,721) | $ (24,332)
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 1,124 | 1,013
Amortization of right-of-use assets | 824 | 642
Accretion of discounts on marketable securities | (4,528) | (3,498)
Sublease termination loss (Note 5) | 4,765 | 0
Stock-based compensation expense | 13,014 | 10,034
Bad debt expense (Note 6) | 0 | 12,313
Non-cash interest expense | 1,695 | 1,686
Inventory write-off | 1,264 | 0
Changes in operating assets and liabilities: |  |
Accounts and other receivables, net | (1,621) | 30,336
Inventories | (9,780) | 1,753
Prepaid expenses and other current assets | (4,800) | (1,304)
Other assets | 118 | 677
Accounts payable | (2,640) | 4,096
Lease liabilities | (1,025) | (793)
Accrued and other liabilities | (6,368) | (5,001)
Net cash (used in) provided by operating activities | (16,679) | 27,622
Investing activities |  |
Purchases of marketable securities | (150,685) | (185,301)
Proceeds from maturities and redemption of marketable securities | 154,265 | 134,250
Purchases of property and equipment, net | (749) | (1,283)
Net cash provided by (used in) investing activities | 2,831 | (52,334)
Financing activities |  |
Proceeds from exercise of stock options | 1,635 | 239
Proceeds from Employee Stock Purchase Plan | 904 | 777
Payments for taxes related to net share settlement of restricted stock units | (6,742) | (4,106)
Net cash used in financing activities | (4,203) | (3,090)
Effect of exchange rate changes on cash and cash equivalents, and restricted cash | (201) | 151
Net decrease in cash and cash equivalents, and restricted cash | (18,252) | (27,651)
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 | 132,304 | 174,560
Supplemental disclosure of cash flow information |  |
Cash paid during the period for income taxes | 949 | 32
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)
Non-cash investing and financing activities: |  |
Purchases of property and equipment, not yet paid | 355 | 926
Right-of-use assets obtained in exchange of operating lease liabilities | $ 0 | $ 278

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