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STOCKHOLDERS' EQUITY - STOCK-BASED COMPENSATION TO SERVICE PROVIDERS (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stock-Based Compensation to Service Providers |  |  |
Stock-based compensation for services by non-employees | $ 364,000 | $ 253,000 | $ 252,000
Consultants | Stock options |  |  |
Stock-Based Compensation to Service Providers |  |  |
Options granted (in shares) |  | 75,000 | 80,000
Stock-based compensation for services by non-employees | $ 311,000 | $ 94,000 | $ 92,000
Consultants and Vendors | Common Stock |  |  |
Stock-Based Compensation to Service Providers |  |  |
Options granted (in shares) | 18,077 | 71,239 | 66,853
Stock-based compensation for services by non-employees | $ 53,000 | $ 158,000 | $ 202,000

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