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Equity Incentive Plan - Narrative (Details)
$ in Thousands
7 Months Ended 12 Months Ended
Aug. 27, 2018
shares
Nov. 01, 2017
shares
Sep. 19, 2017
shares
Aug. 01, 2017
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
May 22, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted (in shares)           0 0    
Allocated stock-based compensation expense | $           $ 3,200 $ 5,400 $ 6,200  
2008 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares authorized under equity incentive plan (in shares)         4,311,796 4,311,796      
2014 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares authorized under equity incentive plan (in shares)         4,978,249 4,978,249      
Vesting period (years)           5 years      
Expirations in period (in shares)             348,373    
2019 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Option and non-option shares granted (in shares)         0        
Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expected future stock-based compensation expense | $         $ 474 $ 474      
Average period of expected future stock option expense           9 months 14 days      
Restricted Stock | 2008 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares authorized under equity incentive plan (in shares)         1,231,941 1,231,941      
Shares available for issuance under equity incentive plan (in shares)             0    
Shares granted (in shares) 3,378                
Restricted Stock | 2008 Equity Incentive Plan | Director                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available for issuance under equity incentive plan (in shares)               34,500  
Restricted Stock | 2014 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares authorized under equity incentive plan (in shares)         1,422,357 1,422,357      
Shares available for issuance under equity incentive plan (in shares)             142,154    
Shares granted (in shares) 11,622                
Vesting period (years) 2 years                
Beginning of vesting period (years) 6 months                
Non-option equity expirations (in shares)             142,154    
Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expected future stock-based compensation expense | $         $ 255 $ 255      
Average period of expected future stock option expense           9 months 7 days      
Stock Options | 2008 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares authorized under equity incentive plan (in shares)         3,079,855 3,079,855      
Shares available for issuance under equity incentive plan (in shares)         0 0      
Stock options granted (in shares)   40,000,000 12,500,000 45,744,000          
Stock Options | 2008 Equity Incentive Plan | Director                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available for issuance under equity incentive plan (in shares)               98,244  
Stock Options | 2008 Equity Incentive Plan | Director | Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period (years)               10 months  
Stock Options | 2008 Equity Incentive Plan | Director | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period (years)               34 months  
Stock Options | 2014 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares authorized under equity incentive plan (in shares)         3,555,892 3,555,892      
Shares available for issuance under equity incentive plan (in shares)             348,373    
Beginning of vesting period (years)           1 year      
Stock option expiration period (years)           10 years      
Employee Stock Option and Stock Appreciation Rights (SARs) | 2019 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares authorized under equity incentive plan (in shares)                 6,000,000
Shares authorized under equity incentive plan, issued in form of restricted stock, reduction (in shares)                 4.5
Restricted Stock And Restricted Stock Units (RSUs) | 2019 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares authorized under equity incentive plan (in shares)                 1,333,333