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Stock-Based Compensation - Restricted Stock Units (Details) - Equity Plan - USD ($)
$ in Thousands
3 Months Ended 77 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Stock-based compensation      
Accrued dividend equivalent units 2,401    
Restricted Stock Units      
Stock-based compensation      
Units granted 607,361    
Number of vested units 260,630    
Number of unvested units 346,731    
Compensation expense recognized $ 500 $ 500  
Unrecognized compensation expense $ 5,400    
Period to recognize unrecognized compensation expense 2 years 4 months 24 days    
Accrued dividend equivalent units 2,401    
Restricted Stock Units | 2020 (remaining nine months)      
Stock-based compensation      
Number of Units to Vest 23,896    
Restricted Stock Units | 2021      
Stock-based compensation      
Number of Units to Vest 179,364    
Restricted Stock Units | 2022      
Stock-based compensation      
Number of Units to Vest 84,415    
Restricted Stock Units | 2023      
Stock-based compensation      
Number of Units to Vest 59,056    
Executives | Restricted Stock Units      
Stock-based compensation      
Units granted     607,361