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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
AXT, Inc. Stockholders' Equity
Noncontrolling Interests
Total
Balance, beginning of period at Dec. 31, 2014 $ 3,532 $ 32 $ 192,665 $ (68,393) $ 7,673 $ 135,509 $ 6,425 $ 141,934
Balance (in shares) at Dec. 31, 2014 883 32,837            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised     165     165   165
Common stock options exercised (in shares)   119            
Series A preferred stock dividend accrued as a result of common stock repurchase     (147)     (147)   (147)
Restricted stock awards canceled   (47)            
Stock-based compensation     1,349     1,349   1,349
Issuance of common stock in the form of restricted stock (in shares)   547            
Net income       (2,228)   (2,228) (305) (2,533)
Dividends declared by joint ventures             (83) (83)
Other comprehensive income (loss)         (3,291) (3,291) (447) (3,738)
Common stock repurchased     (2,287)     (2,287)   (2,287)
Common stock repurchased (in shares)   (908)            
Balance, end of period at Dec. 31, 2015 $ 3,532 $ 32 191,745 (70,621) 4,382 129,070 5,590 134,660
Balance (in shares) at Dec. 31, 2015 883 32,548            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised   $ 1 1,336     1,337   1,337
Common stock options exercised (in shares)   555            
Restricted stock awards canceled   (207)            
Stock-based compensation     1,096     1,096   1,096
Issuance of common stock in the form of restricted stock (in shares)   136            
Net income       5,636   5,636 (670) 4,966
Dividends declared by joint ventures             (52) (52)
Other comprehensive income (loss)         (4,129) (4,129) (488) (4,617)
Balance, end of period at Dec. 31, 2016 $ 3,532 $ 33 194,177 (64,985) 253 133,010 4,380 137,390
Balance (in shares) at Dec. 31, 2016 883 33,032            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised   $ 1 2,476     2,477   2,477
Common stock options exercised (in shares)   762            
Stock-based compensation     1,405     1,405   1,405
Sale of subsidiary shares to noncontrolling interest     1,765     1,765 235 2,000
Issuance of common stock in the form of restricted stock (in shares)   312            
Issuance of common stock, net of stock issuance cost   $ 5 31,856     31,861   31,861
Issuance of common stock, net of stock issuance cost (in shares)   5,307            
Net income       10,148   10,148 (87) 10,061
Dividends declared by joint ventures             (465) (465)
Other comprehensive income (loss)         3,154 3,154 434 3,588
Balance, end of period at Dec. 31, 2017 $ 3,532 $ 39 $ 231,679 $ (54,837) $ 3,407 $ 183,820 $ 4,497 $ 188,317
Balance (in shares) at Dec. 31, 2017 883 39,413