XML 112 R78.htm IDEA: XBRL DOCUMENT v3.22.0.1
Net Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:                      
Net income attributable to AXT, Inc. $ 2,965 $ 3,800 $ 4,385 $ 3,425 $ 2,064 $ 991 $ 361 $ (178) $ 14,575 $ 3,238 $ (2,600)
Less: Preferred stock dividends                 (177) (177) (177)
Net income available to common stockholders                 $ 14,398 $ 3,061 $ (2,777)
Denominator:                      
Denominator for basic net income (loss) per share - weighted-average common shares                 41,367 40,152 39,487
Effect of dilutive securities:                      
Denominator for dilutive net income per common shares                 42,720 41,025 39,487
Basic net income per share:                      
Net income (loss) to common stockholders $ 0.07 $ 0.09 $ 0.11 $ 0.08 $ 0.05 $ 0.02 $ 0.01 $ (0.01) $ 0.35 $ 0.08 $ (0.07)
Diluted net income per share:                      
Net income (loss) to common stockholders $ 0.07 $ 0.09 $ 0.10 $ 0.08 $ 0.05 $ 0.02 $ 0.01 $ (0.01) $ 0.34 $ 0.07 $ (0.07)
Options [Member]                      
Effect of dilutive securities:                      
Effect of dilutive securities (in shares)                 803 602  
Weighted-average shares:                      
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)                 21 862 2,953
Restricted Stock Awards [Member]                      
Effect of dilutive securities:                      
Effect of dilutive securities (in shares)                 550 271  
Weighted-average shares:                      
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)                 118 161 939