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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Cash Flows From Operating Activities |  |
Net loss | $ (39,963) | $ (32,746)
Adjustments to reconcile net loss to cash provided by (used in) operating activities: |  |
Depreciation and amortization expense | 15,218 | 10,563
Non-cash operating lease costs | 5,346 | 4,543
Amortization of deferred contract acquisition costs | 6,060 | 3,499
Stock-based compensation expense | 18,042 | 12,897
Amortization of debt discount and issuance costs | 8,971 | 0
Net accretion of discounts and amortization of premiums on available-for-sale securities | 1,879 | (456)
Deferred income taxes | (1,513) | (117)
Provision for bad debt | 1,470 | 2,209
Other | 79 | (197)
Changes in operating assets and liabilities, net of effect of acquisitions: |  |
Accounts receivable, net | (9,211) | (8,120)
Contract assets | (122) | 284
Deferred contract acquisition costs | (10,866) | (6,486)
Prepaid expenses and other current assets | 614 | (1,086)
Other noncurrent assets | 1,361 | (658)
Accounts payable | 6,181 | 1,507
Accrued expenses and other current liabilities | 10,119 | 40
Operating lease liabilities | (5,352) | (4,804)
Deferred revenue | 14,646 | 6,445
Other noncurrent liabilities | 535 | (1,593)
Net cash provided by (used in) operating activities | 23,494 | (14,276)
Cash Flows From Investing Activities |  |
Purchases of property and equipment | (22,268) | (11,405)
Capitalized internal-use software | (3,445) | (4,922)
Cash paid for acquisitions, net of cash acquired | 0 | (13,639)
Purchases of available-for-sale securities | (188,377) | (110,609)
Maturities of available-for-sale securities | 261,822 | 131,580
Other investing activities | 44 | 223
Net cash provided by (used in) investing activities | 47,776 | (8,772)
Cash Flows From Financing Activities |  |
Proceeds from the exercise of stock options | 7,964 | 2,675
Proceeds from the early exercise of stock options | 95 | 32
Repurchases of unvested common stock | (150) | (70)
Payments on note payable | 0 | (200)
Payment of tax withholding obligation | (530) | (7,115)
Net cash provided by (used in) financing activities | 7,379 | (4,678)
Net increase (decrease) in cash, cash equivalents, and restricted cash | 78,649 | (27,726)
Cash, cash equivalents, and restricted cash, beginning of period | 118,146 | 145,636
Cash, cash equivalents, and restricted cash, end of period | 196,795 | 117,910
Supplemental Disclosure of Cash Flow Information: |  |
Cash paid for interest | 30 | 34
Cash paid for income taxes, net of refunds | 656 | 163
Cash paid for operating lease liabilities | 5,174 | 4,477
Supplemental Disclosure of Non-cash Investing and Financing Activities: |  |
Stock-based compensation capitalized for software development | 660 | 578
Accounts payable and accrued expenses related to property and equipment additions | 2,827 | 4,522
Vesting of early exercised stock options | 1,031 | 1,223
Indemnity holdback consideration associated with business combinations | 0 | 2,188
Issuance of common stock related to an acquisition | 0 | 1,104
Operating lease right-of-use assets obtained in exchange for operating lease liabilities | 3,230 | 2,386
Derecognition of build-to-suit lease | $ 0 | $ 9,886

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