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Stock Based Compensation - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2018
shares
Jul. 31, 2019
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
shares
May 28, 2014
event
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Outstanding number of shares underlying options (in shares)     117,751.000   117,751.000   118,003  
Options granted (in shares)         0      
Unrecognized stock-based compensation expense | $     $ 0   $ 0      
Restricted Stock Units (RSUs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding (in shares)     444,225   444,225   503,518  
Stock-based compensation expense | $     $ 23,000 $ 107,000 $ 50,000 $ 147,000    
Restricted Stock Units (RSUs) | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares expired and forfeited (in shares)   399,855            
Stock options outstanding                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense | $     $ 0 0 $ 0 0    
Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding (in shares)     11,320   11,320      
Stock-based compensation expense | $     $ 1,000 $ 2,000 $ 3,000 $ 12,000    
Equity Incentive Plan, 2014                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for issuance (in shares)     373   373     440,000
Additional shares available for issuance (in shares) 300,000              
Equity Incentive Plan, 2014 | Restricted Stock Units (RSUs) | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares expired and forfeited (in shares)   399,855            
Stock Incentive Plan, 2007 | Stock options outstanding                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for issuance (in shares)     0   0      
Outstanding number of shares underlying options (in shares)     117,726   117,726      
Stock Incentive Plan, 2007 | Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding (in shares)     11,320   11,320      
Stock Incentive Plan, 2000 | Stock options outstanding                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for issuance (in shares)     0   0      
Shares outstanding (in shares)     25   25      
Minimum | Equity Incentive Plan, 2014                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of events to occur to permit granting (or more) | event               1