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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Acquisition-Related Contingent Consideration (Details) - Devicix, LLC - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 01, 2015
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Acquisition-Related Contingent Consideration |  |  |
Contingent consideration paid |  |  | $ 2,500
Significant unobservable inputs (Level 3) |  |  |
Acquisition-Related Contingent Consideration |  |  |
Fair value of contingent liability | $ 34 | $ 70 |

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