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Transactions With Tier Reit, Inc. - Additional Information (Details)
$ in Thousands, shares in Millions
12 Months Ended
Jun. 14, 2019
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]      
Reverse stock split ratio 0.25    
TIER      
Business Acquisition [Line Items]      
Stock conversation ratio 2.98    
Fair value of assets acquired and liabilities assumed $ 1,600,000    
Acquisition expenses   $ 428 $ 52,900
TIER REIT, Inc.      
Business Acquisition [Line Items]      
Number of shares issued | shares 166