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Balance Sheet Parentheticals - USD ($)
shares in Thousands, $ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts receivable $ 4 $ 4
Accumulated depreciation and amortization, property and equipment $ 60,006 $ 58,623
Preferred stock, par value per share (usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000 5,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value per share (usd per share) $ 0.001 $ 0.001
Common stock, shares authorized 225,000 225,000
Treasury stock, shares 236 122
Common Stock    
Common stock, shares issued 106,162 105,711