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Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total Vicor Corporation Stockholders' Equity [Member]
Noncontrolling Interest [Member]
Class B Common Stock [Member]
Beginning Balance at Dec. 31, 2019 $ 205,870 $ 405 $ 201,251 $ 143,098 $ (383) $ (138,927) $ 205,562 $ 308 $ 118
Issuance of Common Stock under employee stock plans 2,061 2 2,059       2,061    
Stock-based compensation expense 710   710       710    
Components of comprehensive income, net of tax:                  
Net income (1,731)     (1,735)     (1,735) 4  
Other comprehensive loss 87       83   83 4  
Total comprehensive income (loss) (1,644)           (1,652) 8  
Ending Balance at Mar. 31, 2020 206,997 407 204,020 141,363 (300) (138,927) 206,681 316 118
Beginning Balance at Dec. 31, 2020 351,155 433 328,392 161,008 (204) (138,927) 350,820 335 118
Issuance of Common Stock under employee stock plans 3,050 2 3,048       3,050    
Stock-based compensation expense 1,571   1,571       1,571    
Components of comprehensive income, net of tax:                  
Net income 15,095     15,092     15,092 3  
Other comprehensive loss (389)       (369)   (369) (20)  
Total comprehensive income (loss) 14,706           14,723 (17)  
Ending Balance at Mar. 31, 2021 $ 370,482 $ 435 $ 333,011 $ 176,100 $ (573) $ (138,927) $ 370,164 $ 318 $ 118