Accounting for Share-Based Payments - Activity (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Number of Options
Granted (in shares)	0	0
Stock options
Number of Options
Balance outstanding at the beginning of the period (in shares)	41,271
Balance outstanding at the end of the period (in shares)	41,271		41,271
Vested awards and those expected to vest at the end of the period (in shares)	39,913
Vested and exercisable at the end of the period (in shares)	14,415
Weighted Average Exercise Price Per Share
Balance outstanding (in dollars per share)	$ 209.07		$ 194.83
Vested awards and those expected to vest at the end of the period (in dollars per share)	216.06
Vested and exercisable at the end of the period (in dollars per share)	$ 586.07
Intrinsic Value
Balance outstanding at the beginning of the period (in dollars)	$ 43,182
Balance outstanding at the end of the period (in dollars)			$ 43,182
Weighted Average Remaining Contractual Term (in years)
Balance outstanding term (in years)	8 years 3 months 29 days		8 years 5 months 1 day
Vested awards and those expected to vest at the end of the period (in years)	8 years 3 months 18 days
Vested and exercisable at the end of the period (in years)	6 years 6 months 7 days
Unrecognized compensation cost related to non-vested stock options outstanding
Unrecognized compensation cost related to non-vested stock (in dollars)	$ 100,000
Weighted average remaining vesting period over which unrecognized compensation is expected to be recognized	2 years 8 months 12 days
Stock options | Minimum
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)	$ 3.24		$ 3.24
Stock options | Maximum
Exercise Price Per Share
Exercise price, high end of the range (in dollars per share)	$ 2,452.80		$ 2,452.80