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Stock Options and Warrants - Options and Equity Incentive Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 08, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Nov. 30, 2015
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options outstanding (in shares)   33,600 56,600 156,200   378,000
Stock-based compensation expense   $ 2,700 $ 596 $ 636    
Total unrecognized compensation   $ 2,400        
Vesting period for unrecognized compensation cost to be recognized (in years)   1 year 9 months        
Proceeds from stock options exercised   $ 163 $ 160 $ 2,800    
Second Amended And Restated 2005 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options outstanding (in shares)   33,600        
Options exercisable (in shares)   33,600        
2015 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares) 2,600,707 2,501,309        
Additional shares authorized after 90 days (in shares)         1,633,209  
Additional shares authorized after 90 days, percent of total available         10.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 1,663,209