v3.20.1
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (5,557,567) $ (5,167,884)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 676,614 809,331
Amortization of debt discount 114,548
Non-cash interest expense 187,500
Depreciation 17,677 20,093
Changes in operating assets and liabilities:    
Increase in trade receivables (7,296) (23,983)
Decrease in inventory 47,158 8,917
(Increase) decrease in prepaid expenses and other current assets (3,121,838) 114,891
Increase (decrease) in accounts payable 309,025 (1,126,565)
Decrease in accrued expenses (328,493) (2,302,112)
Decrease in deferred revenue (2,206) (2,206)
Net cash used in operating activities (7,966,926) (7,367,470)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of short-term investments (3,799,033) (7,966,821)
Maturity of short-term investments 4,794,369 21,263
Purchase of equipment (9,918) (19,219)
Net cash provided by (used in) investing activities 985,418 (7,964,777)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from sale of common stock from at-the-market program, net 2,469,937 15,234,529
Proceeds from exercise of warrants 411,751 620,280
Payments of financing fees (47,024)
Proceeds from exercise of stock options 112,766
Net cash provided by financing activities 2,834,664 15,967,575
Foreign exchange effect on cash (2,181) (2,099)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (4,149,025) 633,229
CASH, CASH EQUIVALENTS AND RESTRICTED CASH – BEGINNING OF PERIOD 16,525,187 17,795,323
CASH, CASH EQUIVALENTS AND RESTRICTED CASH – END OF PERIOD 12,376,162 18,428,552
Cash paid for interest 6,276
Supplemental Disclosure of Non-Cash Financing Activities:    
Conversion of preferred stock to common stock 50
Unrealized loss from investments 5,633 1,008
Issuance of common stock for vested restricted stock units $ 2 $ 7