v3.10.0.1
Condensed Statements of Cash Flows - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (38,387,119) $ (38,140,398)
Adjustments to reconcile net loss to Net cash used in operating activities:    
Depreciation and amortization 820,714 999,396
Stock based compensation 12,804,744 12,472,870
Amortization of prepaid rent from stock issuance to landlord 60,588 60,588
Loss on sales of property and equipment, net   726
Changes in operating assets and liabilities:    
Accounts receivable (208,773) (101,000)
Prepaid expenses and other current assets 497,684 654,654
Other assets (92,548) 15,995
Accounts payable (204,722) (2,537,833)
Accrued expenses 296,668 (209,179)
Deferred revenue 14,500 (102,823)
Net cash used in operating activities (24,398,264) (26,887,004)
Cash flows from investing activities:    
Purchases of property and equipment (561,793) (517,947)
Proceeds from sales of property and equipment   2,800
Net cash used in investing activities (561,793) (515,147)
Cash flows from financing activities:    
Net proceeds from the sales of common stock 38,846,815 14,932,547
Proceeds from the exercise of stock options 1,319,461 738,552
Proceeds from contributions to employee stock purchase plan 550,397 696,274
Net cash provided by financing activities 40,716,673 16,367,373
Net increase (decrease) in cash and cash equivalents 15,756,616 (11,034,778)
Cash and cash equivalents - beginning 12,795,254 31,258,637
Cash and cash equivalents - ending 28,551,870 20,223,859
Restricted Stock Units (RSUs) [Member]    
Supplemental disclosure of non-cash financing activities:    
Common stock issued 7 $ 6
Performance Shares [Member]    
Supplemental disclosure of non-cash financing activities:    
Common stock issued $ 1  

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