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PREFERRED STOCK AND STOCK-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mezzanine Equity [Line Items]      
Liquidation Preference   $ 36,520  
Redeemable convertible preferred stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 111,452,020 111,452,020 111,452,020
Shares Issued and Paid 111,452,020 111,452,020 111,452,020
Carrying Value, Net of issuance costs $ 154,800 $ 154,800 $ 154,800
Liquidation Preference $ 216,574 $ 213,484 $ 201,368
Series A Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 16,078,344 16,078,344 16,078,344
Shares Issued and Paid 16,078,344 16,078,344 16,078,344
Carrying Value, Net of issuance costs $ 385 $ 385 $ 385
Liquidation Preference $ 4,700 $ 4,633 $ 4,370
Series A-1 Redeemable Convertible Preferred Stock [Member]      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 4,297,440 4,297,440 4,297,440
Shares Issued and Paid 4,297,440 4,297,440 4,297,440
Carrying Value, Net of issuance costs $ 638 $ 638 $ 638
Liquidation Preference $ 1,497 $ 1,476 $ 1,392
Series B Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 15,253,512 15,253,512 15,253,512
Shares Issued and Paid 15,253,512 15,253,512 15,253,512
Carrying Value, Net of issuance costs $ 4,497 $ 4,497 $ 4,497
Liquidation Preference $ 10,074 $ 9,930 $ 9,367
Series B-1 Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 2,087,880 2,087,880 2,087,880
Shares Issued and Paid 2,087,880 2,087,880 2,087,880
Carrying Value, Net of issuance costs $ 492 $ 492 $ 492
Liquidation Preference $ 1,132 $ 1,115 $ 1,052
Series C Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 29,537,800 29,537,800 29,537,800
Shares Issued and Paid 29,537,800 29,537,800 29,537,800
Carrying Value, Net of issuance costs $ 25,147 $ 25,147 $ 25,147
Liquidation Preference $ 23,452 $ 23,117 $ 21,805
Series C-1 Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 3,000,000 3,000,000 3,000,000
Shares Issued and Paid 3,000,000 3,000,000 3,000,000
Liquidation Preference $ 1,964 $ 1,936 $ 1,826
Series C-2 Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 8,695,368 8,695,368 8,695,368
Shares Issued and Paid 8,695,368 8,695,368 8,695,368
Carrying Value, Net of issuance costs $ 5,054 $ 5,054 $ 5,054
Liquidation Preference $ 11,883 $ 11,713 $ 11,048
Series D Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 18,605,940 18,605,940 18,605,940
Shares Issued and Paid 18,605,940 18,605,940 18,605,940
Carrying Value, Net of issuance costs $ 30,739 $ 30,739 $ 30,739
Liquidation Preference $ 46,914 $ 46,245 $ 43,621
Series E Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 11,066,882 11,066,882 11,066,882
Shares Issued and Paid 11,066,882 11,066,882 11,066,882
Carrying Value, Net of issuance costs $ 67,858 $ 67,858 $ 67,858
Liquidation Preference $ 90,282 $ 88,995 $ 83,944
Series E-1 Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 2,828,854 2,828,854 2,828,854
Shares Issued and Paid 2,828,854 2,828,854 2,828,854
Carrying Value, Net of issuance costs $ 19,990 $ 19,990 $ 19,990
Liquidation Preference $ 24,676 $ 24,324 $ 22,943
Redeemable preferred stock      
Mezzanine Equity [Line Items]      
Mezzanine Equity, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Shares Authorized 3,500 3,500 3,500
Shares Issued and Paid 3,500 3,500 3,500
Carrying Value, Net of issuance costs $ 10,735 $ 10,735  
Liquidation Preference $ 37,451 $ 36,520