Loss Per Common Share- Computation of Diluted Earnings Loss Per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	28,018	55,045
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	900	8,996
Options and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	25,172	14,937
Series A Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	933	933
DBOT Contingent Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	1,013	8,501
Convertible promissory note and interest
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total		21,678