Financial Instruments Fair Value Measurements - Schedule of Financial Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Fair value of liability	[1]	$ 14,660	$ 8,139
November 2019 Senior Secured Convertible Notes [Member]
Fair value of liability	[1]	1,270	6,439
April 2020 Senior Convertible Notes [Member]
Fair value of liability	[1]	4,600
August 2020 Senior Secured Convertible Notes [Member]
Fair value of liability	[1]	8,790
December 2018 Senior Convertible Note [Member]
Fair value of liability	[1]		1,700
Fair Value, Inputs, Level 1 [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 1 [Member] | November 2019 Senior Secured Convertible Notes [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 1 [Member] | April 2020 Senior Convertible Notes [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 1 [Member] | August 2020 Senior Secured Convertible Notes [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 1 [Member] | December 2018 Senior Convertible Note [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 2 [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 2 [Member] | November 2019 Senior Secured Convertible Notes [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 2 [Member] | April 2020 Senior Convertible Notes [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 2 [Member] | August 2020 Senior Secured Convertible Notes [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 2 [Member] | December 2018 Senior Convertible Note [Member]
Fair value of liability	[1]
Fair Value, Inputs, Level 3 [Member]
Fair value of liability	[1]	14,660	8,139
Fair Value, Inputs, Level 3 [Member] | November 2019 Senior Secured Convertible Notes [Member]
Fair value of liability	[1]	1,270	6,439
Fair Value, Inputs, Level 3 [Member] | April 2020 Senior Convertible Notes [Member]
Fair value of liability	[1]	4,600
Fair Value, Inputs, Level 3 [Member] | August 2020 Senior Secured Convertible Notes [Member]
Fair value of liability	[1]	$ 8,790
Fair Value, Inputs, Level 3 [Member] | December 2018 Senior Convertible Note [Member]
Fair value of liability	[1]		$ 1,700

[1] As noted above, as presented in the fair value hierarchy table, Level-1 represents quoted prices in active markets for identical items, Level-2 represents significant other observable inputs, and Level-3 represents significant unobservable inputs. There were no transfers between the respective Levels during the years ended December 31, 2020 and 2019.