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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (6,020,505) | $ (5,734,681)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 412,351 | 434,291
Stock-based compensation expense | 435,679 | 935,899
Change in provision for doubtful accounts |  | 74,354
Deferred rent | (47,628) | (38,222)
Impairment of intangible assets | 1,375,422 |
Changes in assets and liabilities: |  |
(Increase) decrease in accounts receivable | (150,501) | 582,492
(Increase) decrease in inventory | (14,774) | 4,185
(Increase) decrease in other current assets | (52,051) | 12,889
(Increase) in other assets | (5,883) | (1,498)
Increase (decrease) in accounts payable and accrued expenses | 339,326 | (262,496)
(Decrease) in deferred revenue | (175,128) | (247,631)
Increase in other long-term liabilities | 158,407 |
Net cash used in operating activities | (3,745,285) | (4,240,418)
CASH FLOWS FROM INVESTING activities: |  |
Purchases of property and equipment | (37,614) | (64,075)
Collection on note receivable | 42,460 | 35,587
Net cash provided by (used in) investing activities | 4,846 | (28,488)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Net proceeds from the issuance of common stock | 8,512,861 | 1,777,950
Net proceeds from issuance of common stock from exercise of stock options | 10,100 | 389,879
Net proceeds from the issuance of common stock from exercise of warrants | 139,700 | 336,600
Purchase and retirement of common stock |  | (1,096,608)
Withholding taxes paid on vesting of restricted stock units | (4,233) |
Net cash provided by financing activities | 8,658,428 | 1,407,821
Net increase (decrease) increase in cash | 4,917,989 | (2,861,085)
CASH, beginning of year | 3,092,172 | 5,953,257
CASH, end of year | $ 8,010,161 | $ 3,092,172

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