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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
CONSOLIDATED BALANCE SHEETS    
Valuation allowance $ 59,019 $ 50,652
Common stock, shares authorized (in shares) 90,000,000 90,000,000
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares issued (in shares) 25,701,115 25,623,016
Common stock, shares outstanding (in shares) 25,233,280 25,444,275
Treasury stock, at cost 467,835 178,741