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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Cash Flows From Operating Activities |  |
Net loss | $ (41,381) | $ (39,963)
Adjustments to reconcile net loss to cash provided by (used in) operating activities: |  |
Depreciation and amortization expense | 20,014 | 15,218
Non-cash operating lease costs | 8,610 | 5,346
Amortization of deferred contract acquisition costs | 9,662 | 6,060
Stock-based compensation expense | 33,965 | 18,042
Amortization of debt discount and issuance costs | 1,170 | 8,971
Net accretion of discounts and amortization of premiums on available-for-sale securities | 2,195 | 1,879
Deferred income taxes | 6 | (1,513)
Provision for bad debt | 968 | 1,470
Other | 113 | 79
Changes in operating assets and liabilities, net of effect of acquisitions: |  |
Accounts receivable, net | (30,775) | (9,211)
Contract assets | (250) | (122)
Deferred contract acquisition costs | (15,608) | (10,866)
Prepaid expenses and other current assets | (6,775) | 614
Other noncurrent assets | (85) | 1,361
Accounts payable | 1,862 | 6,181
Accrued expenses and other current liabilities | (25,427) | 10,119
Operating lease liabilities | (9,455) | (5,352)
Deferred revenue | 16,001 | 14,646
Other noncurrent liabilities | (277) | 535
Net cash provided by (used in) operating activities | (35,467) | 23,494
Cash Flows From Investing Activities |  |
Purchases of property and equipment | (24,481) | (22,268)
Capitalized internal-use software | (4,453) | (3,445)
Cash paid for acquisitions, net of cash acquired | (4,380) | 0
Purchases of available-for-sale securities | (264,541) | (188,377)
Maturities of available-for-sale securities | 187,048 | 261,822
Other investing activities | 2 | 44
Net cash provided by (used in) investing activities | (110,805) | 47,776
Cash Flows From Financing Activities |  |
Repayments of convertible senior notes | (16,571) | 0
Proceeds from the exercise of stock options | 3,006 | 7,964
Proceeds from the early exercise of stock options | 62 | 95
Repurchases of unvested common stock | (3) | (150)
Payment of tax withholding obligation on RSU settlement | (748) | (530)
Net cash provided by (used in) financing activities | (14,254) | 7,379
Net increase (decrease) in cash, cash equivalents, and restricted cash | (160,526) | 78,649
Cash, cash equivalents, and restricted cash, beginning of period | 320,958 | 118,146
Cash, cash equivalents, and restricted cash, end of period | 160,432 | 196,795
Supplemental Disclosure of Cash Flow Information: |  |
Cash paid for interest | 48 | 30
Cash paid for income taxes, net of refunds | 874 | 656
Cash paid for operating lease liabilities | 8,291 | 5,174
Supplemental Disclosure of Non-cash Investing and Financing Activities: |  |
Stock-based compensation capitalized for software development | 1,109 | 660
Accounts payable and accrued expenses related to property and equipment additions | 16,922 | 2,827
Vesting of early exercised stock options | 841 | 1,031
Indemnity holdback consideration associated with business combinations | 1,275 | 0
Issuance of common stock related to an acquisition | 1,957 | 0
Operating lease right-of-use assets obtained in exchange for operating lease liabilities | $ 15,966 | $ 3,230

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