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Stockholders' Equity - Summarizes Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Options exercised (43)
Stock Options [Member]    
Options outstanding, beginning balance 136,000 144,000
Options granted 35,000 43,000
Options exercised (2,000)
Options cancelled (3,000) (26,000)
Options forfeited (3,000) (23,000)
Options expired
Options outstanding, ending balance (165,000) 136,000
Options vested and exercisable 75,000  
Weighted average exercise price per share outstanding, beginning balance $ 20.38 $ 24.99
Weighted average exercise price per share granted 7.73 20.59
Weighted average exercise price per share exercised 14.32
Weighted average exercise price per share cancelled 21.49 37.56
Weighted average exercise price per share forfeited 15.51 29.20
Weighted average exercise price per share expired
Weighted average exercise price per share outstanding, ending balance 17.78 $ 20.38
Weighted average exercise price per share vested and exercisable $ 20.06  
Weighted average remaining contractual life (in years) outstanding, beginning balance 8 years 8 months 1 day 8 years 7 months 6 days
Weighted average remaining contractual life (in years) outstanding, ending balance 8 years 7 days 8 years 8 months 1 day
Weighted average remaining contractual life (in years) vested and exercisable 7 years 6 months 18 days  
Aggregate intrinsic value outstanding, beginning balance $ 2 $ 285
Aggregate intrinsic value outstanding, ending balance 36 $ 2
Aggregate intrinsic value vested and exercisable $ 4