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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Preferred Stock, Revenue Recognition, Product Warranties, Advertising, Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Preferred Stock |  |  |
Non-cumulative dividend rate (as a percent) | 12.00% |  |
Liquidation preference (in dollars per share) | $ 1.00 |  |
Preferred stock dividends declared (in dollars per share) | $ 0 | $ 0 |
Revenues |  |  |
Retained Earnings | $ 5,436 | $ 3,889 |
Advertising |  |  |
Advertising expense charged | $ 132 | $ 68 |
Reconciliation of basic and diluted share amounts |  |  |
Basic weighted average common shares outstanding | 2,692,382 | 2,745,602 |
Weighted average common stock equivalents from assumed exercise of stock options (in shares) | 7,232 |  |
Diluted weighted average common shares outstanding | 2,699,614 | 2,745,602 |
Maximum |  |  |
Revenues |  |  |
Percentage of sales (as a percent) | 10.00% | 10.00% |
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 |  |  |
Revenues |  |  |
Retained Earnings |  |  | $ 1,381

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