STOCKHOLDERS' EQUITY - GSR Agreement (Details) - USD ($) $ in Millions	Aug. 14, 2020	Apr. 01, 2020
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction	2,415,000
tZero.com, Inc.
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		508,710
Number of shares sold in transaction as percentage of total shares issued and outstanding		0.50%
Total consideration received from sale of stock		$ 5.0