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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Oct. 31, 2018 | Oct. 31, 2017
Cash flows from operating activities |  |
Net loss | $ (91,730) | $ (69,985)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 3,334 | 2,789
Stock-based compensation | 26,850 | 15,066
Amortization of debt discount and issuance costs | 4,233 | 0
Non-cash interest on office financing lease | 659 | 0
Deferred income taxes | (351) | 163
Change in fair value of warrant liability | 0 | (101)
Change in operating assets and liabilities: |  |
Accounts receivable | 9,267 | (4,653)
Prepaid expenses and other current assets | (4,018) | (2,120)
Deferred commissions | (5,514) | (2,217)
Other long-term assets | (33) | (670)
Accounts payable | (165) | 687
Deferred rent | 1,258 | (85)
Accrued liabilities | 7,184 | 2,163
Deferred revenue | 16,517 | 21,794
Net cash used in operating activities | (32,509) | (37,169)
Cash flows from investing activities |  |
Purchases of property and equipment | (3,698) | (1,714)
Proceeds from maturities of marketable securities | 206,000 | 74,230
Purchases of marketable securities | (369,736) | (72,879)
Net cash used in investing activities | (167,434) | (363)
Cash flows from financing activities |  |
Proceeds from exercise of stock options, including early exercised stock options | 17,631 | 8,201
Proceeds from the issuance of common stock under the Employee Stock Purchase Plan | 5,626 | 0
Repurchase of early exercised stock options | (327) | (149)
Proceeds from borrowings on convertible senior notes, net of issuance costs | 291,145 | 0
Payment for purchase of capped calls | (37,086) | 0
Proceeds from tenant improvement allowance on build-to-suit lease | 633 | 0
Proceeds from the IPO, net of underwriting discounts and commissions | 0 | 205,494
Proceeds from exercise of redeemable convertible preferred stock warrants | 0 | 1
Payment of initial public offering costs | 0 | (2,344)
Net cash provided by financing activities | 277,622 | 211,203
Effect of exchange rate changes on cash, cash equivalents, and restricted cash | (101) | 182
Net increase in cash, cash equivalents and restricted cash | 77,578 | 173,853
Cash, cash equivalents and restricted cash, beginning of period | 62,427 | 69,412
Cash, cash equivalents and restricted cash, end of period | 140,005 | 243,265
Supplemental cash flow disclosure of noncash investing and financing activities |  |
Vesting of early exercised stock options | 1,045 | 950
Costs related to initial public offering included in accounts payable and accrued liabilities | 0 | 1,529
Conversion of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock as a result of warrant exercise | 0 | 1,171
Purchases of property and equipment included in accounts payable and accrued liabilities | 1,806 | 0
Construction in progress related to build-to-suit lease obligations | $ 11,683 | $ 0

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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The fair value of stock issued in noncash financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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