Earnings Per Share - Anti-Dilutive Common Stock Equivalents Summary (Details) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of options (in shares)	611,480	563,680
Exercise price of options lower limit (in dollars per share)	$ 2.89	$ 3.33
Exercise price of options upper limit (in dollars per share)	$ 12.50	$ 12.50
Warrants (in shares)	142,185	142,185
Exercise price of warrants lower limit (in dollars per share)	$ 3.33	$ 3.33
Exercise price of warrants upper limit (in dollars per share)	$ 11.88	$ 11.88
Warrants for Underwriters
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)	141,000	141,000