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v3.20.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities: |  |  |
Net loss | $ (82,739) | $ (37,614) | $ (33,778)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Accretion on marketable securities | (1,020) | (673) |
Depreciation and amortization expense | 125 | 80 | 5
Loss on disposal of property and equipment | 53 |  |
Stock-based compensation expense | 3,694 | 2,793 | 470
Change in fair value of tranche liability |  |  | 14,896
Expense related to acquisition of intellectual property |  |  | 3,157
Changes in operating assets and liabilities: |  |  |
Prepaid expenses and other current assets | (274) | (630) | (876)
Accounts payable | 3,727 | 1,597 | 1,392
Accrued liabilities | 2,756 | (1,022) | 3,749
Other liabilities | (4) | 19 |
Net cash used in operating activities | (73,682) | (35,450) | (10,985)
Investing activities: |  |  |
Purchases of property and equipment | (271) | (362) | (44)
Maturities of marketable securities | 141,500 | 7,500 |
Purchase of marketable securities | (97,103) | (107,854) |
Net cash provided by (used in) investing activities | 44,126 | (100,716) | (44)
Financing activities: |  |  |
Proceeds from public offering, net of issuance costs | 49,747 | 90,908 |
Proceeds from at-the-market offering, net of issuance costs | 6,716 |  |
Deferred offering costs |  | (970) | (568)
Taxes paid related to net share settlement of restricted stock units | (20) |  |
Proceeds from exercise of stock options | 6 | 5 |
Net cash provided by financing activities | 56,449 | 89,943 | 64,378
Net increase (decrease) in cash, cash equivalents and restricted cash | 26,893 | (46,223) | 53,349
Cash, cash equivalents and restricted cash at beginning of period | 7,126 | 53,349 |
Cash, cash equivalents and restricted cash at end of period | 34,019 | 7,126 | 53,349
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Cash paid for income taxes | $ 62 |  |
Conversion of redeemable convertible preferred stock into common stock |  | $ 81,620 |
Series A Redeemable Convertible Preferred Stock |  |  |
Financing activities: |  |  |
Proceeds from issuance of redeemable convertible preferred stock |  |  | 25,000
Series B Redeemable Convertible Preferred Stock |  |  |
Financing activities: |  |  |
Proceeds from issuance of redeemable convertible preferred stock |  |  | $ 39,946

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