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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets    
Investments measured at fair value $ 1,913 $ 1,902
Preferred stock    
Par value (in dollars per share) $ 0.001 $ 0.001
Shares authorized (in shares) 10,000,000 10,000,000
Shares issued (in shares) 0 0
Common stock    
Par value (in dollars per share) $ 0.001 $ 0.001
Shares authorized (in shares) 100,000,000 100,000,000
Shares issued (in shares) 22,818,000 23,153,000
Shares outstanding (in shares) 22,711,000 23,152,000
Treasury stock    
Common shares held (in shares) 107,000 1,000