v3.20.2
Condensed Statements of Cash Flows - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net loss $ (24,359,239) $ (29,007,691)
Adjustments to reconcile net loss to Net cash used in operating activities:    
Depreciation and amortization 286,990 652,266
Stock based compensation 6,318,948 8,069,000
Changes in operating lease right-of-use assets 570,460 599,582
Bad debt expense 33,000  
Changes in operating assets and liabilities:    
Accounts receivable 3,794 (40,950)
Prepaid expenses and other current assets (331,367) (15,503)
Accounts payable (626,053) (556,150)
Accrued expenses (818,306) (174,603)
Operating lease liabilities (514,167) (494,768)
Net cash used in operating activities (19,435,940) (20,968,817)
Cash flows from investing activities:    
Purchases of property and equipment (7,302) (183,935)
Net cash used in investing activities (7,302) (183,935)
Cash flows from financing activities:    
Net proceeds from the sales of common stock 14,723,491 23,319,156
Proceeds from the exercise of stock options   400,103
Proceeds from contributions to employee stock purchase plan 338,896 466,398
Net cash provided by financing activities 15,062,387 23,846,291
Net (decrease) increase in cash and cash equivalents (4,380,855) 2,693,539
Cash and cash equivalents - beginning 21,684,089 20,106,485
Cash and cash equivalents - ending 17,303,234 22,800,024
Supplemental disclosure of non-cash financing activities:    
At-the-market ("ATM") funds receivable 3,165,868  
Restricted Stock Units (RSUs) [Member]    
Cash flows from financing activities:    
Shares repurchased for tax withholdings on vesting   (10,207)
Supplemental disclosure of non-cash financing activities:    
Common stock issued $ 10 9
Performance Shares [Member]    
Cash flows from financing activities:    
Shares repurchased for tax withholdings on vesting   $ (329,159)

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