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EQUITY - Common Stock (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 02, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Mar. 31, 2019
Jun. 30, 2019
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Non-cash stock based compensation   $ 290 $ 415 $ 972 $ 1,393 $ 1,750
Individual Non-employee Director | Common stock equivalents            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Shares granted (in shares) 6,677          
Non Employee Director | Common stock equivalents            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Shares granted (in shares) 40,062          
Award vesting period 2 years          
Non-cash stock based compensation   $ 42 $ 200