Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES - Defined Contribution Pension Plan (Details)

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COMMITMENTS AND CONTINGENCIES - Defined Contribution Pension Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
COMMITMENTS AND CONTINGENCIES.    
Matching contributions and certain other benefits $ 0.1 $ 0.3
Percentage of additional employer matching contribution   50.00%
Percentage of annual contributions per employee   4.00%