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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, 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 21,588