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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2015 | Dec. 31, 2018 | Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | $ 194,532 | $ 188,317 |  |  |
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary | (617) |  |  |  |
Common stock options exercised |  | 66 |  |  |
Stock-based compensation | 558 | 467 |  |  |
Net income (loss) | (1,023) | 3,190 |  |  |
Other comprehensive income | 2,531 | 2,699 |  |  |
Balance, end of period | 195,981 | 194,739 |  | $ 194,532 |
Reclassification adjustment from AOCI | 0 | 0 |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 5,000
Shares repurchased (in shares) |  |  | 908,000 | 0 |
Average price of shares repurchased (in dollars per share) |  |  | $ 2.52 |  |
Total purchase price |  |  | $ 2,300 |  |
Stock repurchase program remaining authorized repurchase amount | 2,700 |  |  |  |
Preferred Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 3,532 | 3,532 |  |  |
Balance, end of period | 3,532 | 3,532 |  | $ 3,532 |
Common Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 40 | 39 |  |  |
Balance, end of period | 40 | 39 |  | 40 |
Additional Paid-In Capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 234,418 | 231,679 |  |  |
Common stock options exercised |  | 66 |  |  |
Stock-based compensation | 558 | 467 |  |  |
Balance, end of period | 234,976 | 232,212 |  | 234,418 |
Accumulated Deficit |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | (45,183) | (54,837) |  |  |
Net income (loss) | (1,104) | 2,875 |  |  |
Balance, end of period | (46,287) | (51,962) |  | (45,183) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | (1,972) | 3,407 |  |  |
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary | (1,150) |  |  |  |
Other comprehensive income | 2,389 | 2,439 |  |  |
Balance, end of period | (733) | 5,846 |  | (1,972) |
AXT, Inc. Stockholders' Equity |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 190,835 | 183,820 |  |  |
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary | (1,150) |  |  |  |
Common stock options exercised |  | 66 |  |  |
Stock-based compensation | 558 | 467 |  |  |
Net income (loss) | (1,104) | 2,875 |  |  |
Other comprehensive income | 2,389 | 2,439 |  |  |
Balance, end of period | 191,528 | 189,667 |  | 190,835 |
Noncontrolling Interests |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 3,697 | 4,497 |  |  |
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary | 533 |  |  |  |
Net income (loss) | 81 | 315 |  |  |
Other comprehensive income | 142 | 260 |  |  |
Balance, end of period | $ 4,453 | $ 5,072 |  | $ 3,697 |

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