Schedule of Outstanding Warrants to Purchase Common Stock (Details) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Class of Warrant or Right [Line Items]
Common stock purchase warrants issued and outstanding	15,456,099	17,249,757
Weighted average exercise price /share	$ 1.68	$ 1.57
Series Z Warrants [Member]
Class of Warrant or Right [Line Items]
Common stock purchase warrants issued and outstanding	15,074,281	16,814,939
Weighted average exercise price /share	$ 1.60	$ 1.60
Warrants expiration date	Apr. 30, 2024	Apr. 30, 2024
UPO - Series Z Warrants [Member]
Class of Warrant or Right [Line Items]
Common stock purchase warrants issued and outstanding		53,000
Weighted average exercise price /share		$ 1.60
Warrants expiration date	Jan. 31, 2021	Jan. 31, 2021
Series W Warrants [Member]
Class of Warrant or Right [Line Items]
Common stock purchase warrants issued and outstanding	381,818	381,818
Weighted average exercise price /share	$ 5.00	$ 5.00
Warrants expiration date	Jan. 31, 2022	Jan. 31, 2022