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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 (Loss)
AXT, Inc. Stockholders' Equity
Noncontrolling Interests
Total
Balance, beginning 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
Net dividend 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 interests     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 costs   $ 5 31,856     31,861   31,861
Issuance of common stock, net of stock issuance costs (in shares)   5,307            
Net income       10,148   10,148 (87) 10,061
Net dividend 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            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised     628     628   628
Common stock options exercised (in shares)   238            
Purchase of subsidiary shares from noncontrolling interest     187     187 (1,794) (1,607)
Restricted stock awards canceled   (10)            
Stock-based compensation     1,925     1,925   1,925
Issuance of common stock in the form of restricted stock (in shares)   344            
Net income       9,654   9,654 1,355 11,009
Other comprehensive income (loss)         (5,379) (5,379) (361) (5,740)
Balance, end of period at Dec. 31, 2018 $ 3,532 $ 39 $ 234,419 $ (45,183) $ (1,972) $ 190,835 $ 3,697 $ 194,532
Balance (in shares) at Dec. 31, 2018 883 39,985