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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jun. 14, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 13, 2017
Share-based Compensation Arrangement by Share-based Payment Award            
Stock-based compensation expense   $ 0.4 $ 0.3 $ 1.6 $ 1.4  
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award            
Restricted stock granted (in shares)       153,069    
Restricted stock granted, grant date fair value (in dollars per share)       $ 13.54    
Employee restricted stock award, vesting period       2 years    
Non-employee restricted stock award vest grant over period       1 year    
Nonvested restricted shares outstanding (in shares)   136,301   136,301    
Unrecognized compensation cost   $ 0.9   $ 0.9    
Unrecognized compensation cost, recognition period       18 months    
Restricted Stock | Grant Date            
Share-based Compensation Arrangement by Share-based Payment Award            
Restricted stock award, vesting percentage       33.33%    
Restricted Stock | First Anniversary            
Share-based Compensation Arrangement by Share-based Payment Award            
Restricted stock award, vesting percentage       33.33%    
Restricted Stock | Second Anniversary            
Share-based Compensation Arrangement by Share-based Payment Award            
Restricted stock award, vesting percentage       33.33%    
Amended and Restated 2013 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Number of additional shares authorized (in shares) 1,000,000          
Number of shares reserved for issuance (in shares) 1,700,000         700,000
Shares available for issuance (in shares)   1,032,329   1,032,329    
Long Term Incentive Plan | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award            
Performance period       3 years    
Service period       2 years