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4. PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Prepaid expenses and other current assets | Prepaid expenses and other current assets are summarized as follows:
|  | December 31, 2018 |  |  | December 31, 2017 |
Prepaid insurance |  | $ | 29,524 |  |  | $ | 25,402 |
Deposit on future raw material purchases |  |  | 226,547 |  |  |  | 30,272 |
Total prepaid expenses and other current assets |  | $ | 256,071 |  |  | $ | 55,674 |

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