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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Preferred Stock, Revenue Recognition, Product Warranties, Advertising, Net Income (Loss) Per Common Share (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
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
Revenue Recognition |  |
Percentage of sales (as a percent) | 10.00% | 10.00%
Advertising |  |
Advertising expense charged | $ 68,000 | $ 131,000
Reconciliation of basic and diluted share amounts |  |
Basic weighted average common shares outstanding | 2,745,602 | 2,747,424
Weighted average common stock equivalents from assumed exercise of stock options (in shares) |  | 2,121
Diluted weighted average common shares outstanding | 2,745,602 | 2,749,545
Outstanding options excluded from computation of income per share as effect would be antidilutive (in shares) |  | 23,250

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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