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FAIR VALUE MEASUREMENTS - Level 3 Rollforward of Warrant Liability (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Fair Value Disclosures [Abstract]  
Warrant liability, beginning of year $ 14,977
Recognized loss from mark-to-market adjustment prior to reclassification of warrant liability to equity 957
Reclassification from warrant liability to equity (15,934)
Warrant liability, end of year $ 0