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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Cash Flows From Operating Activities |  |
Net loss | $ (32,746) | $ (17,114)
Adjustments to reconcile net loss to cash used in operating activities: |  |
Depreciation and amortization expense | 10,563 | 6,170
Non-cash operating lease costs | 4,543 | 0
Amortization of deferred contract acquisition costs | 3,499 | 2,319
Stock-based compensation expense | 12,897 | 1,057
Net accretion of discounts and amortization of premiums on available-for-sale securities | (456) | (518)
Deferred income taxes | (117) | 0
Provision for bad debt | 2,209 | 259
Change in fair value of redeemable convertible preferred stock warrant liability | 0 | 118
Other | (197) | 4
Changes in operating assets and liabilities, net of effect of acquisitions: |  |
Accounts receivable, net | (8,120) | (5,616)
Contract assets | 284 | 180
Deferred contract acquisition costs | (6,486) | (4,225)
Prepaid expenses and other current assets | (1,086) | (121)
Other noncurrent assets | (658) | (148)
Accounts payable | 1,507 | (2,553)
Accrued expenses and other current liabilities | 40 | 1,022
Operating lease liabilities | (4,804) | 0
Deferred revenue | 6,445 | 7,400
Other noncurrent liabilities | (1,593) | 2,076
Net cash used in operating activities | (14,276) | (9,690)
Cash Flows From Investing Activities |  |
Purchases of property and equipment | (11,405) | (9,036)
Capitalized internal-use software | (4,922) | (3,397)
Cash paid for acquisitions, net of cash acquired | (13,639) | 0
Purchases of available-for-sale securities | (110,609) | (14,856)
Sales of available-for-sale securities | 0 | 1,978
Maturities of available-for-sale securities | 131,580 | 40,498
Other investing activities | 223 | 22
Net cash provided by (used in) investing activities | (8,772) | 15,209
Cash Flows From Financing Activities |  |
Proceeds from the exercise of stock options | 2,675 | 681
Proceeds from the early exercise of stock options | 32 | 1,638
Repurchases of unvested common stock | (70) | (4)
Payments on note payable | (200) | (90)
Proceeds from build-to-suit lease financing obligation drawdown | 0 | 23
Payment of tax withholding obligation on RSU settlement | (7,115) | 0
Net cash provided by (used in) financing activities | (4,678) | 2,248
Net increase (decrease) in cash, cash equivalents, and restricted cash | (27,726) | 7,767
Cash, cash equivalents, and restricted cash, beginning of period | 145,636 | 31,426
Cash, cash equivalents, and restricted cash, end of period | 117,910 | 39,193
Supplemental Disclosure of Cash Flow Information: |  |
Cash paid for interest | 34 | 214
Cash paid for income taxes | 163 | 299
Cash paid for operating lease liabilities | 4,477 | 0
Supplemental Disclosure of Non-cash Investing and Financing Activities: |  |
Stock-based compensation capitalized for software development | 578 | 71
Accounts payable and accrued expenses related to property and equipment additions | 4,522 | 3,493
Vesting of early exercised stock options | 1,223 | 496
Deferred offering costs, accrued but not paid | 0 | 475
Indemnity holdback consideration associated with business combinations | 2,188 | 0
Issuance of common stock related to an acquisition | 1,104 | 0
Operating lease right-of-use assets obtained in exchange for operating lease liabilities | 2,386 | 0
Derecognition of build-to-suit lease | $ 9,886 | $ 0

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