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Consolidated Statements of Cash Flows - USD ($)
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities    
Net loss $ (12,678,131) $ (4,269,528)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,138,225 260,173
Amortization of debt discount   51,913
Amortization of debt issuance costs   5,522
Non-cash interest expense   284,439
Change in fair value of warrant and embedded derivative liabilities   (88,242)
Depreciation 5,115 1,169
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (168,255) (127,058)
Other assets (30,875)  
Accounts payable 1,142,675 316,282
Accrued expenses 1,328,988 299,656
Net cash used in operating activities (9,262,258) (3,265,674)
Cash flows from investing activities    
Purchases of equipment (22,252) (11,676)
Net cash used in investing activities (22,252) (11,676)
Cash flows from financing activities    
Proceeds from issuance of convertible notes   7,282,470
Debt issuance costs   (12,489)
Deferred financing fees   (154,704)
Payment of loan from related party   (41,469)
Net cash provided by financing activities   7,073,808
Net increase in cash (9,284,510) 3,796,458
Cash at beginning of period 48,036,260 2,617,815
Cash at end of period $ 38,751,750 $ 6,414,273