v3.21.1
Statements of Cash Flows - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (31,832,086) $ (38,399,089)
Adjustments to reconcile net loss to Net cash used in operating activities:    
Depreciation and amortization 356,310 781,228
Stock based compensation 7,897,970 10,646,580
Change in operating lease right-of-use assets 764,285 786,342
Bad debt expense 21,377 35,000
Loss on disposal of property and equipment 4,134 7,463
Changes in operating assets and liabilities:    
Accounts receivable (34,083) (53,594)
Prepaid expenses and other current assets (186,471) 130,809
Other assets 800  
Accounts payable (574,680) (189,866)
Accrued expenses (486,810) 284,748
Operating lease liabilities (722,291) (662,766)
Deferred revenue   12,000
Net cash used in operating activities (24,791,545) (26,621,145)
Cash flows used in investing activities:    
Purchases of property and equipment (136,631) (196,199)
Net cash used in investing activities (136,631) (196,199)
Cash flows from financing activities:    
Net proceeds from the sales of common stock 53,556,202 23,319,156
Net proceeds from an at-the-market ("ATM") offerings 53,556,202 4,557,693
Proceeds from the exercise of stock options   400,103
Proceeds from contributions to employee stock purchase plan 417,546 457,362
Net cash provided by financing activities 53,973,748 28,394,948
Net increase in cash and cash equivalents 29,045,572 1,577,604
Cash and cash equivalents - beginning 21,684,089 20,106,485
Cash and cash equivalents - ending 50,729,661 21,684,089
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 $ 12 11
Performance Shares [Member]    
Cash flows from financing activities:    
Shares repurchased for tax withholdings on vesting   $ (329,159)

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