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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Valuation allowance $ 50,564 $ 48,453
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) 25,615,216 25,301,732
Common stock, shares outstanding (in shares) 25,442,300 25,128,773
Treasury stock, at cost 172,916 172,959