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STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |
Net loss | $ (5,243,819) | $ (4,509,172) | $ (5,772,958) | $ (5,749,382)
Adjustments to reconcile net loss to net cash used in operating activities |  |  |  |
Warrants issued for services | 57,005 | 62,731 | 78,390 | 416,934
Stock options issued for services | 500,591 | 339,076 | 387,688 | 794,738
Common stock issued for services and fees | 373,888 | 135,333 | 172,192 | 270,343
Depreciation and amortization and noncash patent expenses | 499,197 | 322,495 | 465,795 | 325,946
Loss on disposal of property and equipment |  | 10,084 | 10,084 |
(Increase) decrease in assets |  |  |  |
Prepaid expenses and other current assets | 269,630 | 268,560 | 247,288 | (447,977)
(Decrease) increase in liabilities |  |  |  |
Accounts payable | (39,051) | (31,610) | 96,533 | (10,819)
Accounts payable and accrued expenses-related parties | 24,201 | 43,962 | 5,054 | 3,211
Deferred lease liability | (25,394) |  |  |
Accrued expenses | 29,354 | (46,305) | (91,031) | 34,886
Net cash used in operating activities | (3,554,398) | (3,404,846) | (4,400,965) | (4,362,120)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |
Cost of intangibles | (52,022) | (371,320) | (397,479) | (81,743)
Purchase of property and equipment | (215,513) | (897,774) | (1,037,384) | (183,789)
Sale of property and equipment |  | 2,500 | 2,500 |
Net cash used in investing activities | (267,535) | (1,266,594) | (1,432,363) | (265,532)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |
Exercise of options and warrants |  | 161,500 | 161,500 | 502,500
Issuance of common stock, institutional investor | 4,165,585 | 3,612,400 | 4,863,535 | 5,722,060
Repayment of equipment purchase payable | (350,500) | (380,470) | (499,409) | (71,425)
Net cash provided by financing activities | 3,815,085 | 3,393,430 | 4,525,626 | 6,153,135
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (6,848) | (1,278,010) | (1,307,702) | 1,525,483
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD | 2,174,625 | 3,482,327 | 3,482,327 | 1,956,844
CASH AND CASH EQUIVALENTS - END OF PERIOD | 2,167,777 | 2,204,317 | 2,174,625 | 3,482,327
Supplemental Disclosure of Non-cash investing and financing activities: |  |  |  |
Operating Lease - Right of Use - Building and Operating lease liability | 885,094 |  |  |
Equipment acquisition funded by liability | $ 774,081 |  |  | 749,316
Common stock for service, paid in advance |  |  |  | $ 36,250

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