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Condensed Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]    
Net income (loss) $ (1,202) $ 337
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes (15) 10
Total comprehensive income (loss) $ (1,217) $ 347