Stock-Based Compensation - Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
NUMBER OF SHARES
Beginning balance (in shares) | shares	163,016
Granted (in shares) | shares	73,500
Exercised (in shares) | shares	0
Canceled (in shares) | shares	(24,472)
Ending balance (in shares) | shares	212,044
Stock exercisable (in shares) | shares	50,133
WEIGHTED AVERAGE EXERCISE PRICE
Beginning balance (in dollars per share) | $ / shares	$ 41.70
Granted (in dollars per share) | $ / shares	13.95
Exercised (in dollars per share) | $ / shares	0
Canceled (in dollars per share) | $ / shares	40.00
Ending balance (in dollars per share) | $ / shares	32.28
Stock exercisable (in dollars per share) | $ / shares	$ 45.24
WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE (YEARS)
Stock outstanding (in years)	3 years 6 months
Stock exercisable (in years)	2 years 9 months 18 days
AGGREGATE INTRINSIC VALUE
Stock outstanding | $	$ 46
Stock exercisable | $	$ 0