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NET LOSS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:          
Net income (loss) $ (3,508) $ (7,479) $ (23,746) $ (625) $ (7,189)
Less dividends attributable to redeemable and redeemable convertible preferred stock (5,541) (2,947) (13,636) (11,398) (10,753)
Net loss attributable to common stockholders $ (9,049) $ (10,426) $ (37,382) $ (12,023) $ (17,942)
Denominator:          
Weighted average common shares outstanding - basic and diluted 29,185,545 22,045,779 25,004,093 19,210,017 17,046,120
Net loss per share attributable to common stockholders - basic and diluted $ (0.31) $ (0.47) $ (1.50) $ (0.63) $ (1.05)