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BASIS OF PRESENTATION Basis of Presentation (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 10, 2019 | Mar. 15, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 29, 2018
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  | $ (6,505,364) | $ (4,237,024) | $ (11,319,910) | $ (9,807,979) | $ (9,246,673) | $ (5,472,104) | $ (22,062,298) | $ (24,526,756) | $ 34,500,000
Net cash used in operating activities |  |  |  |  |  |  |  |  | (16,815,092) | $ (20,182,753) | $ 28,100,000
Sale of registered stock (in shares) | 700,000 | 7,272,727 |  |  |  |  |  |  |  |  |
Proceeds from sale of equity, gross | $ 800,000 | $ 8,000,000.0 |  |  |  |  |  |  |  |  |
Shares issued (in usd per share) | $ 1.10 | $ 1.10 |  |  |  |  |  |  |  |  |
Cash and cash equivalents and marketable debt securities |  |  | $ 26,000,000.0 |  |  |  |  |  | $ 26,000,000.0 |  |

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