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Stock Options and Warrants - Options and Equity Incentive Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Nov. 30, 2015
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 56,600 156,200 378,000   440,800
Stock-based compensation expense $ 596 $ 636 $ 385    
Total unrecognized compensation $ 3,100        
Vesting period for unrecognized compensation cost to be recognized (in years) 2 years 9 months        
Proceeds from stock options exercised $ 200 $ 2,800 $ 1,000    
Second Amended And Restated 2005 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 56,619        
Options exercisable (in shares) 56,619        
2015 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares)       952,498  
Additional shares authorized after 90 days (in shares)       1,633,209  
Additional shares authorized after 90 days, percent of total available       10.00%