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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock granted (in shares) 154,030 164,241 118,361
Restricted stock, weighted average fair value $ 2.4 $ 2.2 $ 1.7
Employee restricted stock award, vesting period 2 years    
Nonemployee restricted stock award vest grant over period 1 year    
Unrecognized compensation cost $ 0.1    
Unrecognized compensation cost, recognition period 15 years    
Shares tendered by employees to satisfy minimum statutory tax withholding obligations (in shares) 19,245    
Restricted Stock | Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock award, percentage vested on grant date 33.33%    
Restricted Stock | Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock award, percentage vested on grant date 33.33%    
Restricted Stock | Tranche Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock award, percentage vested on grant date 33.33%    
2013 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate shares of common stock permitted to be granted (in shares) 1,700,000    
Shares of common stock reserved for issuance (in shares) 890,990    
Stock-based compensation $ 2.4 $ 2.0 $ 1.5