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Stockholders' Equity - Summarizes Stock Option Activity (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Options outstanding, beginning balance 165,000 136,000
Options granted 8,000 35,000
Options exercised
Options cancelled (8,000) (3,000)
Options forfeited (9,000) (3,000)
Options expired
Options outstanding, ending balance 156,000 165,000
Options vested and exercisable 112,000  
Weighted average exercise price per share outstanding, beginning balance $ 17.78 $ 20.38
Weighted average exercise price per share granted 6.66 7.73
Weighted average exercise price per share exercised
Weighted average exercise price per share cancelled 16.76 21.49
Weighted average exercise price per share forfeited 9.87 15.51
Weighted average exercise price per share expired
Weighted average exercise price per share outstanding, ending balance 17.74 $ 17.78
Weighted average exercise price per share vested and exercisable $ 18.71  
Weighted average remaining contractual life (in years) outstanding, beginning balance 8 years 7 days 8 years 8 months 2 days
Weighted average remaining contractual life (in years) outstanding, ending balance 7 years 1 month 13 days 8 years 7 days
Weighted average remaining contractual life (in years) vested and exercisable 6 years 11 months 1 day  
Aggregate intrinsic value outstanding, beginning balance $ 36 $ 2
Aggregate intrinsic value outstanding, ending balance $ 36
Aggregate intrinsic value vested and exercisable