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Equity Compensation Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2017
Aug. 31, 2016
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Aug. 05, 2014
Aug. 04, 2014
May 08, 2014
Performance-Based Restricted Stock Units                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Grant of restricted stock 162,613 146,552              
Restricted shares, vesting term 3 years 3 years              
Closing price of common stock on grant date $ 5.66 $ 4.96              
Unrecognized stock compensation expense     $ 128   $ 128        
Compensation expense related to restricted stock grant     $ 4 $ 4 $ 8 $ 8      
Dividend equivalent rights, granted 0 0              
Performance-Based Restricted Stock Units | Return to Capital Exceeds 10%                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Restricted shares, vesting term 10 years 10 years              
Performance-Based Restricted Stock Units | Involuntary Termination                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Restricted shares, vesting term 3 years 3 years              
Performance-Based Restricted Stock Units | Minimum                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Percentage of total return to stockholders 10.00% 10.00%              
Anworth Mortgage Asset Corporation 2014 Equity Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Maximum authorized shares of common stock under grant of stock options and other stock-based awards             2,000,000   2,000,000
Anworth Mortgage Asset Corporation 2004 Equity Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Maximum authorized shares of common stock under grant of stock options and other stock-based awards               3,500,000  
Anworth Mortgage Asset Corporation 2007 Dividend Equivalent Rights Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Dividend equivalent right issued, term         5 years        
Dividend equivalent right issued     746,611   746,611        
Dividend equivalent rights outstanding     746,611   746,611        
Paid or accrued compensation related to dividend equivalent right issued     $ 68 77 $ 68 168      
2016 Award Grants | Performance-Based Restricted Stock Units                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Compensation expense related to restricted stock grant       $ 21   $ 21