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Stock-based Compensation - Stock Option Activity (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Number Outstanding        
Outstanding at beginning of period (in shares)     455,000 537,500
Granted during period (in shares) 0 0 0 0
Forfeited or expired during period (in shares)     (5,000) (82,500)
Outstanding at end of period (in shares) 450,000 455,000 450,000 455,000
Exercisable at end of period (in shares) 360,000 275,000 360,000 275,000
Weighted Average Exercise Price        
Outstanding at beginning of period (in dollars per share)     $ 1.67 $ 2.19
Forfeited or expired during period (in dollars per share)     6.00 4.89
Outstanding at end of period (in dollars per share) $ 1.62 $ 1.67 1.62 1.67
Exercisable at end of period (in dollars per share) $ 1.62 $ 1.70 $ 1.62 $ 1.70
Additional disclosures        
Stock based compensation expense $ 10 $ 19 $ 10 $ 19
Unrecognized compensation cost, options $ 26   $ 26  
Period of recognition for unrecognized compensation cost     8 months