Stock-Based Compensation - Stock-based compensation expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ 943,000	$ 475,000
Service based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	1,697,000	1,863,000
Restricted stock units - Service based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	344,000	372,000
Stock option awards - Service based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	1,354,000	1,491,000
Performance based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	(754,000)	(1,388,000)
Restricted stock awards - Performance based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	(390,000)	0
Restricted stock units - Performance based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	0	(1,148,000)
Stock option awards - Performance based awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ (364,000)	$ (240,000)