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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash Flows from Operating Activities: |  |
Net loss | $ (12,827,343) | $ (10,889,316)
Reconciliation of net loss to net cash used in operating activities: |  |
Depreciation and amortization | 124,627 | 39,811
Changes in fair value of warrant liabilities | (31,000) | 16,000
Stock-based compensation | 2,705,365 | 2,889,243
Amortization on right-of-use assets | 96,973 | 89,178
Changes in operating assets and liabilities: |  |
Prepaid expenses and deposits | (1,106,072) | (349,750)
Interest receivable | 52,749 | 10,023
Accounts payable and accrued expenses | 2,770,341 | 225,135
Lease liability | (187,068) | (89,907)
Net cash used in operating activities | (8,401,428) | (8,059,583)
Cash Flows from Investing Activities: |  |
Purchase of property and equipment | (1,299,193) | (305,382)
Purchase of construction in progress | (2,629,141) | 0
Net cash used in investing activities | (3,928,334) | (305,382)
Cash Flows from Financing Activities: |  |
Proceeds from exercise of stock options | 0 | 57,744
Proceeds from exercise of warrants | 550,000 | 5,379
Net cash provided by financing activities | 550,000 | 63,123
Net decrease in cash | (11,779,762) | (8,301,842)
Cash and cash equivalents at beginning of the period | 43,903,949 | 61,746,748
Cash and cash equivalents at end of the period | 32,124,187 | 53,444,906
Supplemental schedule of non-cash financing activities: |  |
Issuance of common stock as commitment fee for future financing | 345 | 0
Recognition of right-of-use assets and lease liability from new operating lease agreements | $ 9,184,027 | $ 0

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