LOSS PER COMMON SHARE - Schedule of Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities that were excluded from EPS (in shares)	5,595	5,936
Outstanding warrants on common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities that were excluded from EPS (in shares)	3,556	3,556
Restricted stock unit awards granted under the 2018 Equity Incentive Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities that were excluded from EPS (in shares)	395	238
Outstanding stock option awards granted under the 2018 Equity Incentive Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities that were excluded from EPS (in shares)	1,644	2,047
Restricted stock units granted under the Earnout Incentive Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities that were excluded from EPS (in shares)	0	95