Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES - Defined Contribution Pension Plan (Details)

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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES - Defined Contribution Pension Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Matching contributions and certain other benefits $ 0.3 $ 0.3
Percentage of additional employer matching contribution 50.00% 50.00%
Percentage of annual contributions per employee 4.00% 4.00%