Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Nov. 03, 2020
Warrants [Abstract]
Number of shares received upon automatic exercise of warrant (in shares)	2,000,000
Warrant exercise price (in dollars per share)	$ 0.001
Change in fair value of warrant	$ 6,800
Exercise of warrants (in shares)	0
Proceeds from warrant exercises	$ 1,821
Common Stock [Member]
Warrants [Abstract]
Common Stock issued upon warrant exercises (in shares)	428,571	428,571
Senior Secured Notes Due 2025 [Member]
Warrants [Abstract]
Interest rate	12.50%		12.50%
Debt maturity date	Jun. 30, 2025
Number of shares received upon automatic exercise of warrant (in shares)	714,000
Senior Secured Notes Due 2025 - First Additional Offering [Member]
Warrants [Abstract]
Number of shares received upon automatic exercise of warrant (in shares)	143,000
Warrant exercise price (in dollars per share)	$ 0.001
Change in fair value of warrant	$ 735