Stock-Based Compensation - Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
NUMBER OF SHARES
Beginning balance (in shares) | shares	163,016
Granted (in shares) | shares	71,500
Canceled (in shares) | shares	(21,094)
Ending balance (in shares) | shares	213,422
Stock exercisable (in shares) | shares	49,857
WEIGHTED AVERAGE EXERCISE PRICE
Beginning balance (in dollars per share) | $ / shares	$ 41.70
Granted (in dollars per share) | $ / shares	14.03
Canceled (in dollars per share) | $ / shares	41.37
Ending balance (in dollars per share) | $ / shares	32.46
Stock exercisable (in dollars per share) | $ / shares	$ 45.17
WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE (YEARS)
Stock outstanding, weighted average remaining contractual life	3 years 8 months 12 days
Stock exercisable, weighted average remaining contractual life	3 years
AGGREGATE INTRINSIC VALUE
Stock outstanding | $	$ 1
Stock exercisable | $	$ 0