Equity and Stock-based Compensation - Performance Share Awards (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense		$ 439,000	$ 230,000	$ 636,000	$ 313,000
Performance Share Awards | 2001 Nonqualified Stock Plan | Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted (in shares)	20,000
Total stock-based compensation expense			12,000	0	24,000
Share based compensation expense for the total grant	$ 55,000
Performance Share Awards | 2001 Nonqualified Stock Plan | Officer | October 2019 Grant
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted (in shares)	10,000
Total stock-based compensation expense			$ 0	$ 0	$ 14,000
Share based compensation expense for the total grant	$ 29,000