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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 loss | $ (111,441) | $ (150,920) | $ (88,641)
Adjustments to reconcile net loss to net cash used by operating activities: |  |  |
Stock-based compensation | 43,387 | 38,830 | 23,844
Depreciation expense and amortization of intangible assets | 9,473 | 7,297 | 5,743
Bad debt expense | 1,091 | 1,298 | 410
Amortization of debt issuance costs | 444 | 43 | 0
Loss on disposal of property and equipment | 0 | 3 | 79
Deferred income taxes | (1,541) | (1,089) | (498)
Foreign currency transaction gains, net | (12,263) | 0 | 0
Changes in assets and liabilities: |  |  |
Accounts receivable | (1,868) | (37,922) | (33,904)
Prepaid expenses and other assets | (54,753) | (2,027) | 2,094
Deferred commissions | (8,043) | (12,298) | (21,588)
Accounts payable and accrued expenses | (1,394) | (3,289) | 11,467
Accrued compensation and related benefits | (3,157) | 6,582 | 12,598
Other current and non-current liabilities | (1,134) | (264) | (444)
Deferred revenue | 28,668 | 47,534 | 33,378
Operating lease assets and liabilities | 2,089 | (329) | 1,544
Net cash used by operating activities | (110,442) | (106,551) | (53,918)
Cash flows from investing activities: |  |  |
Proceeds from maturities of investments | 91,670 | 84,642 | 120,593
Purchases of investments | (53,443) | (65,283) | (41,870)
Purchases of property and equipment | (9,637) | (9,095) | (6,058)
Payments for acquisitions, net of cash acquired | 0 | 0 | (30,729)
Net cash provided by investing activities | 28,590 | 10,264 | 41,936
Cash flows from financing activities: |  |  |
Proceeds from borrowings | 92,000 | 120,000 | 0
Payments for debt issuance costs | (276) | (1,940) | 0
Debt repayments | (3,563) | (625) | 0
Payments for employee taxes related to the net share settlement of equity awards | (9,748) | 0 | 0
Proceeds from exercise of common stock options | 752 | 25,432 | 2,786
Net cash provided by financing activities | 79,165 | 142,867 | 2,786
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | 1,657 | (159) | 694
Net (decrease) increase in cash, cash equivalents, and restricted cash | (1,030) | 46,421 | (8,502)
Cash, cash equivalents, and restricted cash at beginning of period | 150,381 | 103,960 | 112,462
Cash, cash equivalents, and restricted cash at end of period | 149,351 | 150,381 | 103,960
Supplemental cash flow information: |  |  |
Cash paid for interest | 16,906 | 1,671 | 323
Cash paid for income taxes | 3,999 | 1,239 | 1,505
Supplemental non-cash investing and financing information: |  |  |
Accrued capital expenditures | $ 654 | $ 1,774 | $ 379

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