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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (13,239,027) | $ (13,562,290)
Adjustments to reconcile net loss to cash used in operating activities: |  |
Depreciation and amortization | 82,265 | 1,546,048
Stock-based compensation | 721,209 | 758,757
Impairment of goodwill | 1,675,462 | 0
Gain on revaluation of derivative warrants | (62,050) | (22,075)
Gain on disposal of fixed assets | (50,898) | 0
Changes in: |  |
Prepaid expenses and other current assets | (229,045) | 281,396
Accounts payable and accrued liabilities | (258,794) | 451,325
Other assets | (81,214) | (473,462)
Cash used in operating activities | (11,442,092) | (11,020,301)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of fixed assets | (384,993) | (346,703)
Proceeds from sale of fixed assets | 55,000 | 0
Cash used in investing activities | (329,993) | (346,703)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Payments on capital lease obligations | (3,036) | (2,727)
Reverse stock split fractional shares | (762) | 0
Proceeds from issuance of common stock, net of underwriting issuance costs | 9,075,777 | 4,905,945
Proceeds from issuance of preferred stock | 5,949,301 | 2,265,257
Change in deferred issuance costs | 0 | (116,337)
Proceeds from conversion of warrants | 0 | 2,963,259
Payments on long-term obligations | 0 | (86,591)
Cash provided by financing activities | 15,021,280 | 9,928,806
INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | 3,249,195 | (1,438,198)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD | 10,061,421 | 11,499,619
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD | 13,310,616 | 10,061,421
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION |  |
Cash paid for interest expense | 0 | 364
Beneficial conversion feature and related deemed dividend on preferred stock | $ 2,241,795 | $ 1,448,945

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