BUSINESS SEGMENT - Schedule of Revenue by Geographical Location (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Revenues | $ 11,681 | $ 12,375 | $ 11,802 | $ 9,762 | $ 9,418 | $ 10,135 | $ 9,674 | $ 8,071 | $ 45,620 | $ 37,298 | $ 31,004 |
| U.S. | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Revenues | 34,909 | 28,839 | 24,910 | ||||||||
| International | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Revenues | $ 10,711 | $ 8,459 | $ 6,094 | ||||||||