v3.19.3
Condensed Statements of Cash Flows - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (29,007,691) $ (38,387,119)
Adjustments to reconcile net loss to Net cash used in operating activities:    
Depreciation and amortization 652,266 820,714
Stock based compensation 8,069,000 12,804,744
Changes in operating lease right-of-use assets 599,582  
Amortization of prepaid rent from stock issuance to landlord   60,588
Changes in operating assets and liabilities:    
Accounts receivable (40,950) (208,773)
Prepaid expenses and other current assets (15,503) 497,684
Other assets   (92,548)
Accounts payable (556,150) (204,722)
Accrued expenses (174,603) 296,668
Deferred revenue   14,500
Operating lease liabilities (494,768)  
Net cash used in operating activities (20,968,817) (24,398,264)
Cash flows from investing activities:    
Purchases of property and equipment (183,935) (561,793)
Net cash used in investing activities (183,935) (561,793)
Cash flows from financing activities:    
Net proceeds from the sales of common stock 23,319,156 38,846,815
Proceeds from the exercise of stock options 400,103 1,319,461
Proceeds from contributions to employee stock purchase plan 466,398 550,397
Net cash provided by financing activities 23,846,291 40,716,673
Net increase in cash and cash equivalents 2,693,539 15,756,616
Cash and cash equivalents - beginning 20,106,485 12,795,254
Cash and cash equivalents - ending 22,800,024 28,551,870
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 9 7
Performance Shares [Member]    
Cash flows from financing activities:    
Shares repurchased for tax withholdings on vesting $ (329,159)  
Supplemental disclosure of non-cash financing activities:    
Common stock issued   $ 1

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