Warrants - Outstanding and Exercisable (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Class of Warrant or Right [Line Items]
Warrants Outstanding, Number Outstanding | shares	430
Warrants Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 6 months
Warrants Outstanding, Weighted Average Exercise Price (per share) | $ / shares	$ 27.61
Warrants Exercisable, Number Exercisable | shares	430
Warrants Exercisable, Weighted Average Exercise Price (per share) | $ / shares	$ 27.61
Warrants 2016 [Member]
Class of Warrant or Right [Line Items]
Warrants Outstanding, Number Outstanding | shares	6
Warrants Outstanding, Weighted Average Remaining Contractual Life (Years)	0 years
Warrants Outstanding, Weighted Average Exercise Price (per share) | $ / shares	$ 466.26
Warrants Exercisable, Number Exercisable | shares	6
Warrants Exercisable, Weighted Average Exercise Price (per share) | $ / shares	$ 466.26
Warrants 2017 [Member]
Class of Warrant or Right [Line Items]
Warrants Outstanding, Number Outstanding | shares	23
Warrants Outstanding, Weighted Average Remaining Contractual Life (Years)	4 months 24 days
Warrants Outstanding, Weighted Average Exercise Price (per share) | $ / shares	$ 118.95
Warrants Exercisable, Number Exercisable | shares	23
Warrants Exercisable, Weighted Average Exercise Price (per share) | $ / shares	$ 118.95
Warrants 2018 [Member]
Class of Warrant or Right [Line Items]
Warrants Outstanding, Number Outstanding | shares	120
Warrants Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 2 months 12 days
Warrants Outstanding, Weighted Average Exercise Price (per share) | $ / shares	$ 19.20
Warrants Exercisable, Number Exercisable | shares	120
Warrants Exercisable, Weighted Average Exercise Price (per share) | $ / shares	$ 19.20
Warrants 2019 [Member]
Class of Warrant or Right [Line Items]
Warrants Outstanding, Number Outstanding | shares	281
Warrants Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 9 months 18 days
Warrants Outstanding, Weighted Average Exercise Price (per share) | $ / shares	$ 13.76
Warrants Exercisable, Number Exercisable | shares	281
Warrants Exercisable, Weighted Average Exercise Price (per share) | $ / shares	$ 13.76