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STATEMENTS OF CASH FLOWS - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities    
Net loss $ (27,048,808) $ (24,162,279)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation 2,871,000 3,805,000
Write-off of deferred offering costs 100,056 0
Accrued interest on convertible notes 0 280,394
Amortization of debt discount 1,067,379 2,513,475
Depreciation 21,607 19,555
Beneficial conversion feature 0 3,077,887
Change in fair value of derivative liability (873,000) (50,000)
Change in fair value of warrant liabilities 54,200 0
Extinguishment of derivative liability (370,000) 0
Warrant inducement expense 1,265,780 0
Loss on extinguishment of debt 1,049,166 0
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (50,145) (298,724)
Accounts payable 124,973 86,412
Accrued expenses 3,921,424 (441,050)
Accrued interest (101,624) 0
Net cash used in operating activities (17,967,992) (15,169,330)
Cash flows from investing activities    
Purchase of property and equipment (11,934) (13,943)
Purchase of restricted deposit 0 (75,000)
Loan payments from related party 0 75,000
Net cash used in investing activities (11,934) (13,943)
Cash flows from financing activities    
Borrowings from convertible notes 5,000,000 3,345,000
Payments of debt issuance costs (57,000) (50,000)
Payments of convertible notes (7,790,557) (275,000)
Proceeds from issuance of common stock and warrants 20,706,919 18,132,661
Proceeds from exercise of stock options 30,064 182,428
Proceeds from exercise of warrants 0 928,178
Payment of deferred offering costs (1,045,468) (1,706,657)
Net cash provided by financing activities 16,843,958 20,556,610
Net (decrease) increase in cash and cash equivalents (1,135,968) 5,373,337
Cash and cash equivalents as of beginning of year 5,728,900 355,563
Cash and cash equivalents as of end of year 4,592,932 5,728,900
Supplemental disclosure of cash flow information    
Cash paid during the year for interest 874,203 280,287
Supplemental disclosure of non-cash financing activities    
Conversion of convertible notes and accrued interest to common stock 0 9,229,819
Assumption of liabilities from reverse recapitalization transaction 0 978,674
Warrants issued to placement agents 0 913,000
Commissions payable in connection with exercise of warrants 0 87,152
Accrued interest converted to convertible note payable 0 156,667
Non-cash addition of derivative liability 1,281,000 420,000
Non-cash addition of deferred offering costs 151,137 54,706
Deferred offering costs reclassified to additional paid-in capital $ 0 $ 159,795