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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Cash flows from operating activities: |  |
Net loss | $ (51,219) | $ (20,838)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 2,107 | 970
Share-based compensation | 3,828 | 405
Loss on disposal of assets | 22 | 8
Non-cash interest expense | 182 |
Change in fair value of convertible notes payable | 9,758 |
Changes in operating assets and liabilities: |  |
Prepaid expenses | 648 | (3,190)
Accounts receivable | 273 |
Other assets | (852) | (30)
Accounts payable | 207 | 234
Accrued expenses | 2,436 | 1,306
Deferred revenue | (3,872) | (2,629)
Net cash used in operating activities | (36,482) | (23,764)
Cash flows from investing activities: |  |
Purchases of property, equipment and software | (13,219) | (1,747)
Net cash used in investing activities | (13,219) | (1,747)
Cash flows from financing activities: |  |
Proceeds from stock option exercises | 379 | 82
Issuance of Series B convertible preferred stock, net of issuance costs |  | 88,020
Deferred offering costs | (2,507) | (50)
Issuance of convertible notes | 39,550 |
Proceeds from IPO, net of underwriting discounts and commissions | 135,185 |
Net cash provided by financing activities | 172,607 | 88,052
Net increase in cash and cash equivalents | 122,906 | 62,541
Cash and cash equivalents—beginning of period | 103,193 | 62,802
Cash and cash equivalents —end of period | 226,099 | 125,343
Supplemental disclosures of noncash financing and investing activities: |  |
Common stock issued on conversion of convertible notes | 49,490 |
Property, equipment and software additions included in accounts payable, accrued expenses and other current liabilities | $ 2,052 | 1,088
Series B convertible preferred stock offering costs included in accounts payable, accrued expenses and other current liabilities |  | 194
Deferred offering costs included in accounts payable, accrued expenses and other current liabilities |  | $ 31

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