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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning Balance at Dec. 31, 2020 $ (3,921) $ 5 $ 102,361   $ (106,287)
Beginning Balance, shares at Dec. 31, 2020   5,241      
Stock-based compensation 1,177   1,177    
Net loss (4,157)       (4,157)
Ending Balance at Mar. 31, 2021 (6,901) $ 5 103,538   (110,444)
Ending Balance, shares at Mar. 31, 2021   5,241      
Beginning Balance at Dec. 31, 2020 (3,921) $ 5 102,361   (106,287)
Beginning Balance, shares at Dec. 31, 2020   5,241      
Net loss (9,586)        
Ending Balance at Jun. 30, 2021 (11,164) $ 5 104,705   (115,874)
Ending Balance, shares at Jun. 30, 2021   5,257      
Beginning Balance at Dec. 31, 2020 (3,921) $ 5 102,361   (106,287)
Beginning Balance, shares at Dec. 31, 2020   5,241      
Net loss (10,800)        
Ending Balance at Dec. 31, 2021 $ 42,069 $ 22 159,246   (117,199)
Ending Balance, shares at Dec. 31, 2021 21,579 21,579      
Beginning Balance at Mar. 31, 2021 $ (6,901) $ 5 103,538   (110,444)
Beginning Balance, shares at Mar. 31, 2021   5,241      
Issuance of common stock under stock plan, net (30)   (30)    
Issuance of common stock under stock plan, net, shares   16      
Stock-based compensation 1,137   1,137    
Net loss (5,430)       (5,430)
Ending Balance at Jun. 30, 2021 (11,164) $ 5 104,705   (115,874)
Ending Balance, shares at Jun. 30, 2021   5,257      
Beginning Balance at Dec. 31, 2021 $ 42,069 $ 22 159,246   (117,199)
Beginning Balance, shares at Dec. 31, 2021 21,579 21,579      
Issuance of common stock under stock plan, net $ (9)   (9)    
Issuance of common stock under stock plan, net, shares   9      
Stock-based compensation 1,171   1,171    
Net unrealized loss on available-for-sale securities (37)     $ (37)  
Net loss (6,754)       (6,754)
Ending Balance at Mar. 31, 2022 36,440 $ 22 160,408 (37) (123,953)
Ending Balance, shares at Mar. 31, 2022   21,588      
Beginning Balance at Dec. 31, 2021 $ 42,069 $ 22 159,246   (117,199)
Beginning Balance, shares at Dec. 31, 2021 21,579 21,579      
Net unrealized loss on available-for-sale securities $ (41)        
Net loss (13,797)        
Ending Balance at Jun. 30, 2022 $ 31,081 $ 22 162,096 (41) (130,996)
Ending Balance, shares at Jun. 30, 2022 21,832 21,832      
Beginning Balance at Mar. 31, 2022 $ 36,440 $ 22 160,408 (37) (123,953)
Beginning Balance, shares at Mar. 31, 2022   21,588      
Issuance of common stock under stock plan, net (50)   (50)    
Issuance of common stock under stock plan, net, shares   244      
Stock-based compensation 1,738   1,738    
Net unrealized loss on available-for-sale securities (4)     (4)  
Net loss (7,043)       (7,043)
Ending Balance at Jun. 30, 2022 $ 31,081 $ 22 $ 162,096 $ (41) $ (130,996)
Ending Balance, shares at Jun. 30, 2022 21,832 21,832