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Consolidated Balance Sheets (Parenthetical) - USD ($) | Dec. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Allowance for doubtful accounts | $ 5,052 | $ 129,365 | $ 23,046 | $ 26,046
Accumulated depreciation | $ 2,403,717 | 516,144 | 113,158 | 77,861
Convertible promissory notes, issuance costs |  | $ 24,144 |  |
Common stock, par value | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001
Common stock, shares authorized | 200,000,000 | 200,000,000 | 200,000,000 | 200,000,000
Common stock, shares issued | 45,906,077 | 44,013,075 | 28,394,503 | 22,487,793
Common stock, shares outstanding | 45,906,077 | 44,013,075 | 28,394,503 | 22,487,793
Other Intangible Assets [Member] |  |  |  |
Accumulated amortization | $ 791,008 | $ 61,803 |  |
Licensing Agreements [Member] |  |  |  |
Accumulated amortization | 145,833 | 108,833 | $ 58,333 | $ 45,833
Patents [Member] |  |  |  |
Accumulated amortization | $ 437,760 | $ 134,701 | $ 49,627 | $ 25,166

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