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Stock-Based Compensation - Summary of Option Activity (Details) - Stock options - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Options Outstanding and Exercisable      
Options outstanding, beginning of year (in shares) 106,250 74,200 317,576
Options granted (in shares) 546,196 56,250 30,000
Options exercised (in shares) 0 0 (260,126)
Options expired / forfeited (in shares) (20,000) (24,200) (13,250)
Options outstanding, end of year (in shares) 632,446 106,250 74,200
Options vested and exercisable (in shares) 247,780 82,915 34,199
Weighted Average Exercise Price      
Options outstanding, end of year (in usd per shares) $ 15.22 $ 13.76 $ 5.07
Options granted (in usd per shares) 11.10 13.87 20.67
Options exercised (in usd per shares) 0.00 0.00 4.30
Options expired / forfeited (in usd per shares) 16.90 7.59 6.90
Options outstanding, end of year (in usd per shares) 11.61 15.22 13.76
Options vested and exercisable,Weighted Average Exercise Price (in usd per shares) $ 13.30 $ 14.04 $ 8.44
Options outstanding, end of year, Aggregate Intrinsic Value $ 183 $ 0 $ 670
Options outstanding, end of year, Weighted Average Remaining Contractual Term (in years) 4 years 3 years 9 months 18 days 3 years
Options vested and exercisable, Aggregate Intrinsic Value $ 69 $ 0 $ 491
Options vested and exercisable, Weighted Average Remaining Contractual Term (in years) 3 years 4 months 24 days 3 years 10 months 24 days 1 year 7 months 6 days
2007 Equity Incentive Plan      
Number of Options Outstanding and Exercisable      
Options granted (in shares) 243,750