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Stock Based Compensation - Narrative (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2018
shares
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
Apr. 12, 2018
shares
Dec. 31, 2017
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)   1,192,000     1,202,000  
Options granted (in shares)   0        
Unrecognized stock-based compensation expense | $   $ 0        
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares outstanding (in shares)   990,000     1,752,000  
Stock-based compensation expense | $   $ 40,000 $ 130,000      
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense | $   $ 0 18,000      
Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares outstanding (in shares)   113,000     341,000  
Stock-based compensation expense | $   $ 10,000 $ 15,000      
Equity Incentive Plan, 2014            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuance (in shares)   1,824,000       4,400,000
Equity Incentive Plan, 2014 | Restricted Stock Units (RSUs) | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuance (in shares) 514,000          
Shares granted (in shares) 1,310,000          
Equity Incentive Plan, 2014 | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of events to occur to permit granting (or more) | event           1
Amended Equity Incentive Plan, 2014 | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proposed shares available for issuance (in shares)       3,000,000    
Stock Incentive Plan, 2007 | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuance (in shares)   0        
Outstanding number of shares underlying options (in shares)   1,191,000        
Stock Incentive Plan, 2007 | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares outstanding (in shares)   113,000        
Stock Incentive Plan, 2000 | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuance (in shares)   0        
Outstanding number of shares underlying options (in shares)   500