Stockholders' Equity (Warrants and Common Stock Warrants) (Details) - Common stock warrants - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Warrants
Number of warrants, outstanding (in shares)	28,926	28,926
Number of Warrants
Outstanding at beginning of period (in shares)	28,926
Outstanding at end of period (in shares)	28,926	28,926
Weighted Average Exercise Price Per Share
Outstanding at beginning of period (in dollars per share)	$ 9.80
Outstanding at end of period (in dollars per share)	$ 9.80	$ 9.80
Weighted Average Remaining Contractual Life
Weighted average remaining contractual life, outstanding (in years)	3 years 4 months 28 days	3 years 7 months 28 days
Number of Warrants Exercisable
Outstanding at beginning of period (in shares)	28,926
Outstanding at end of period (in shares)	28,926	28,926
Weighted Average Price Per Share
Outstanding at beginning of period (in dollars per share)	$ 9.80	$ 9.80
Outstanding at end of period (in dollars per share)	$ 9.80	$ 9.80