v3.20.2
Condensed Statements of Cash Flows - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net loss $ (16,802,402) $ (20,823,464)
Adjustments to reconcile net loss to Net cash used in operating activities:    
Depreciation and amortization 217,629 476,863
Stock based compensation 4,346,206 5,969,325
Changes in operating lease right-of-use assets 378,593 293,210
Bad debt expense 33,000  
Changes in operating assets and liabilities:    
Accounts receivable (75,082) (2,950)
Prepaid expenses and other current assets (212,727) 94,681
Accounts payable (330,537) (534,124)
Accrued expenses (429,460) 332,767
Operating lease liabilities (341,064) (230,219)
Net cash used in operating activities (13,215,844) (14,423,911)
Cash flows from investing activities:    
Purchases of property and equipment   (172,811)
Net cash used in investing activities   (172,811)
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 217,204 318,589
Net cash provided by financing activities 14,940,695 23,698,482
Net increase in cash and cash equivalents 1,724,851 9,101,760
Cash and cash equivalents - beginning 21,684,089 20,106,485
Cash and cash equivalents - ending 23,408,940 29,208,245
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 $ 6 6
Performance Shares [Member]    
Cash flows from financing activities:    
Shares repurchased for tax withholdings on vesting   $ (329,159)

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