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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowances for doubtful accounts $ 11 $ 11
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 42,000,000 42,000,000
Common stock, shares issued 30,213,383 30,124,494
Treasury stock, shares 801,920 801,920