Stock-Based Compensation, Warrants (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Mar. 23, 2020	Jan. 28, 2020	Dec. 31, 2019	Nov. 06, 2019	Oct. 25, 2019
Class of Warrant or Right [Abstract]
Exercise price of warrants (in dollars per share)		$ 11.18	$ 16.50		$ 29.83	$ 42.30
Warrants [Member]
Class of Warrant or Right [Abstract]
Warrants outstanding (in shares)	1,631,948			231,629
Warrants [Member] | Minimum [Member]
Class of Warrant or Right [Abstract]
Exercise price of warrants (in dollars per share)	$ 9.00
Warrants exercisable period	10 months
Warrants [Member] | Maximum [Member]
Class of Warrant or Right [Abstract]
Exercise price of warrants (in dollars per share)	$ 53,550
Warrants exercisable period	4 years 10 months 24 days