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Basis of Presentation and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Summary of computation of basic and diluted net income (loss) per share    
Weighted average shares outstanding (shares) 16,435 16,529
Dilutive potential common shares:    
Restricted stock (in shares) 112 0
Stock options (in shares) 701 0
Shares used to compute diluted income per share (shares) 17,248 16,529
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) 4,277 10,144