Stock Compensation - Schedule of Stock Options and Stock Appreciation Rights (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Share Underlying Awards
Outstanding, beginning of the period (in shares)	807,820	982,324
Granted (in shares)	0	324,450
Exercised (in shares)	0	0
Forfeited or expired (in shares)	(8,250)	(498,954)
Outstanding, ending of the period (in shares)	799,570	807,820	982,324
Exercisable, ending balance (in shares)	572,858	403,831
Vested and expected to vest, ending balance (in shares)	799,570	807,820
Weighted-Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 6.44	$ 9.38
Granted (in dollars per share)	0	3.34
Exercised (in dollars per share)	0	0
Forfeited or expired (in dollars per share)	3.34	10.17
Outstanding, ending balance (in dollars per share)	6.47	6.44	$ 9.38
Exercisable (in dollars per share)	7.43	8.66
Vested and expected to vest, ending balance (in dollars per share)	$ 6.47	$ 6.44
Weighted-Average Remaining Contractual Term (years)
Outstanding	6 years 8 months 1 day	7 years 8 months 8 days	7 years 2 months 4 days
Granted	0 years	9 years 3 months
Exercised	0 years	0 years
Forfeited or expired	9 years 5 months 4 days	6 years 3 months 7 days
Exercisable, ending balance	6 years 1 month 9 days	6 years 5 months 23 days
Vested and expected to vest, ending balance	6 years 8 months 1 day	7 years 8 months 8 days
Weighted-Average Remaining Contractual Term (years)
Exercised	0 years	0 years
Forfeited or expired	5 years 5 months 1 day	5 years 8 months 1 day
Stock appreciation rights (SAR)
Number of Awards
Outstanding, beginning of the period (in shares)	83,875	105,925
Granted (in shares)	0	5,450
Exercised (in shares)	0	0
Forfeited or expired (in shares)	(35,750)	(27,500)
Outstanding, end of the period (in shares)	48,125	83,875	105,925
Exercisable end of the period (in shares)	48,125	76,558
Vested and expected to vest end of the period (in shares)	48,125	83,875
Weighted-Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 8.90	$ 9.12
Granted (in dollars per share)	0	3.34
Exercised (in dollars per shares)	0	0
Forfeited or expired (in dollars per share)	10.32	12.00
Outstanding, ending balance (in dollars per share)	12.00	8.90	$ 9.12
Exercisable, ending balance (in dollars per share)	12.00	9.42
Vested and expected to vest, ending balance (in dollars per share)	$ 12.00	$ 8.90
Weighted-Average Remaining Contractual Term (years)
Outstanding	4 years 8 months 8 days	6 years	6 years 9 months
Granted	0 years	9 years 3 months
Exercisable	4 years 8 months 8 days	5 years 8 months 19 days
Vested and expected to vest	4 years 8 months 8 days	6 years