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Consolidated Statements of Cash Flows - USD ($)
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities    
Net loss $ (15,079,355) $ (12,678,131)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,147,246 1,138,225
Amortization of debt (premium) discount 233,251  
Depreciation 20,500 5,115
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 537,963 (168,255)
Other assets (6,470) (30,875)
Accounts payable (42,528) 1,142,675
Accrued expenses (543,627) 1,328,988
Net cash used in operating activities (13,733,020) (9,262,258)
Cash flows from investing activities    
Purchases of equipment (6,294) (22,252)
Net cash used in investing activities (6,294) (22,252)
Cash flows from financing activities    
Procceds from issuance of common stock, net 14,781,092  
Proceeds from exercise of options 219,905  
Proceeds from exercise of warrants 114,269  
Net cash provided by financing activities 15,115,266  
Net increase in cash 1,375,952 (9,284,510)
Cash at beginning of period 36,618,497 48,036,260
Cash at end of period $ 37,994,449 $ 38,751,750