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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |
Net loss | $ (22,127,000) | $ (16,306,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation | 1,813,000 | 244,000
Depreciation expense | 95,000 | 27,000
Reserve for uncollectible accounts |  | 167,000
Gain on disposal of assets | (45,000) |
Changes in assets and liabilities: |  |
Prepaid expenses and other current assets | (1,013,000) | 561,000
Operating lease right-of-use assets | 894,000 | 864,000
Other assets | (118,000) |
Accounts payable | 345,000 | (205,000)
Accrued expenses and other current liabilities | (87,000) | 1,734,000
Operating lease liabilities | (900,000) | (840,000)
Net cash used in operating activities | (21,143,000) | (13,754,000)
Cash flows from investing activities: |  |
Purchases of property and equipment | (1,775,000) | (211,000)
Net cash used in investing activities | (1,775,000) | (211,000)
Cash flows from financing activities: |  |
Proceeds from initial public offering, net of underwriting discount | 59,892,000 |
Payment of initial public offering costs | (2,383,000) | (226,000)
Proceeds from exercise of stock options | 8,000 | 111,000
Net cash provided by (used in) financing activities | 87,703,000 | (115,000)
Net increase (decrease) in cash and cash equivalents | 64,785,000 | (14,080,000)
Cash and cash equivalents and restricted cash, beginning of period | 10,137,000 | 24,217,000
Cash and cash equivalents and restricted cash, end of period | 74,922,000 | 10,137,000
Supplemental disclosure of non-cash financing and investing activities: |  |
Property and equipment purchases included in accounts payable | 205,000 | 2,000
Conversion of redeemable convertible preferred stock | 160,227,000 |
Accretion of redeemable convertible preferred stock to redemption value | 115,000 | 313,000
Right-of-use asset obtained in exchange of operating lease obligation | 13,000 | 4,046,000
Deferred offering costs included in accounts payable and accrued expense |  | $ 870,000
Series C Preferred Stock |  |
Cash flows from financing activities: |  |
Proceeds from the sale of Series C redeemable convertible preferred stock | 30,392,000 |
Payment of offering costs related to sale of Series C redeemable convertible preferred stock | (206,000) |
Supplemental disclosure of non-cash financing and investing activities: |  |
Allocation of Series C redeemable convertible preferred stock to common stock warrant | $ 740,000 |

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