Net Income (Loss) Per Common Share - Basic and Diluted - Schedule of Common Stock Equivalents Outstanding (Details) - shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Stock options	18,252,500	24,605,000	20,400,000
Warrants	7,065,000	50,090,000
Common stock equivalents	67,535,000	117,250,000
Series B Preferred Stock
Weighted average shares, outstanding	337,500	425,000
Series C Preferred Stock
Weighted average shares, outstanding	41,880,000	42,130,000