| Income (Loss) Per Share (Tables) | 12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Earnings Per Share [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Computation of Basic and Diluted Income (Loss) Per Share | The following table presents the computation of basic and diluted loss per share for 2020, 2019 and 2018 (in thousands, except per share data): 
 
 
 (1) We have no dilutive securities. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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