Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Summary of computation of basic and diluted net income (loss) per share        
Weighted average shares outstanding (shares) 16,082,000 18,770,000 16,222,000 19,586,000
Dilutive potential common shares:        
Restricted stock (in shares) 0 0 0 35,000
Stock options (in shares) 0 0 0 728,000
Shares used to compute diluted income per share (shares) 16,082,000 18,770,000 16,222,000 20,349,000
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) 7,028,000 11,549,000 8,330,000 8,694,000