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CONDENSED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance at Dec. 31, 2019 $ (30,553) $ (34) $ 11 $ 7,621 $ (38,185) $ (34)
Beginning Balance, Shares at Dec. 31, 2019     1,070      
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member          
Contributions from PDL $ 1,519     1,519    
Distributions to PDL (97)     (97)    
Settlement of phantom stock-based awards 783     783    
Net loss (3,686)       (3,686)  
Ending Balance at Mar. 31, 2020 (32,068)   $ 11 9,826 (41,905)  
Ending Balance, Shares at Mar. 31, 2020     1,070      
Beginning Balance at Dec. 31, 2019 $ (30,553) $ (34) $ 11 7,621 (38,185) $ (34)
Beginning Balance, Shares at Dec. 31, 2019     1,070      
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member          
Ending Balance at Jun. 30, 2020 $ (36,275)   $ 11 10,116 (46,402)  
Ending Balance, Shares at Jun. 30, 2020     1,070      
Beginning Balance at Mar. 31, 2020 (32,068)   $ 11 9,826 (41,905)  
Beginning Balance, Shares at Mar. 31, 2020     1,070      
Contributions from PDL 290     290    
Net loss (4,497)       (4,497)  
Ending Balance at Jun. 30, 2020 (36,275)   $ 11 10,116 (46,402)  
Ending Balance, Shares at Jun. 30, 2020     1,070      
Beginning Balance at Dec. 31, 2020 67,210   $ 109 125,094 (57,993)  
Beginning Balance, Shares at Dec. 31, 2020     10,933      
Stock-based compensation 2,301     2,301    
Net loss (5,182)       (5,182)  
Ending Balance at Mar. 31, 2021 64,329   $ 109 127,395 (63,175)  
Ending Balance, Shares at Mar. 31, 2021     10,933      
Beginning Balance at Dec. 31, 2020 $ 67,210   $ 109 125,094 (57,993)  
Beginning Balance, Shares at Dec. 31, 2020     10,933      
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201912Member          
Ending Balance at Jun. 30, 2021 $ 61,628   $ 110 129,055 (67,537)  
Ending Balance, Shares at Jun. 30, 2021     10,957      
Beginning Balance at Mar. 31, 2021 64,329   $ 109 127,395 (63,175)  
Beginning Balance, Shares at Mar. 31, 2021     10,933      
Issuance of common stock under the 2020 ESPP 170   $ 1 169    
Issuance of common stock under the 2020 ESPP, Shares     24      
Stock-based compensation 1,491     1,491    
Net loss (4,362)       (4,362)  
Ending Balance at Jun. 30, 2021 $ 61,628   $ 110 $ 129,055 $ (67,537)  
Ending Balance, Shares at Jun. 30, 2021     10,957