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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities |  |
Net loss | $ (1,859,991) | $ (1,349,270)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Accrued income on marketable securities | (13,955) | (326)
Depreciation and amortization | 56,452 | 60,718
Reserve and write-off for obsolete inventory | 24,460 | (32,333)
Reserve for doubtful accounts |  | 40,859
Amortization of deferred compensation | 3,469 | 5,203
Share based compensation to employees - options | 2,712 | 5,036
Share based compensation to employees - restricted stock | 5,175 |
Share based compensation to non-employees - restricted stock | 12,545 |
Changes in assets and liabilities: |  |
Decrease in trade receivables | 547,773 | 43,351
Decrease in trade receivables - related party |  | 7,458
(Increase)/decrease in deposits and other receivables | (12,905) | 10,692
Increase in deposit and other receivables - related party | (33,243) |
Increase in inventories | (50,795) | (100,878)
(Increase)/decrease in prepaid expenses | (89,497) | 69,930
Decrease in prepaid expenses - related party | 12,927 | 16,140
Decrease in trade and other payables | (384,683) | (200,059)
Decrease in trade and other payables - related party | (20,816) | (138,184)
Net cash used in operating activities | (1,800,372) | (1,561,663)
Cash flows from investing activities |  |
Purchases of property, plant and equipment | (37,827) | (16,774)
Purchases of marketable securities | (3,972,386) | (1,202,210)
Proceeds from sale of marketable securities | 302,095 | 1,095,218
Net cash used in investing activities | (3,708,118) | (123,766)
Cash flows from financing activities |  |
Net proceeds from issuance of common stock |  | 3,452,861
Net proceeds from exercise of warrants for common stock | 5,717,325 | 244,950
Net cash provided by financing activities | 5,717,325 | 3,697,811
Net increase in cash | 208,835 | 2,012,382
Cash at beginning of period | 438,432 | 72,700
Cash at end of period | 647,267 | 2,085,082
Supplemental Schedule of Non-Cash Financing and Investing Activities |  |
Net unrealized gains/(losses) on marketable securities | (16,843) | 156
Conversion of Series B Preferred Stock to common shares | $ 1,755,000 |

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