Basis of Presentation and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Summary of computation of basic and diluted net income (loss) per share
Weighted average shares outstanding (in shares)	16,688	16,082	16,595	16,222
Dilutive potential common shares:
Restricted stock (in shares)	75	0	85	0
Stock options (in shares)	379	0	507	0
Shares used to compute diluted income per share (in shares)	17,142	16,082	17,187	16,222
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (in shares)	5,574	7,028	4,984	8,330