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Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | $ 188,317,000 |  |  |  |  |
Common stock options exercised | 66,000 |  |  |  |  |
Stock-based compensation | 467,000 |  |  |  |  |
Net income | 3,190,000 | $ 425,000 |  |  |  |
Other comprehensive income | 2,699,000 | 352,000 |  |  |  |
Balance, end of period | 194,739,000 |  | $ 188,317,000 |  |  |
Reclassification adjustment from AOCI | 0 | $ 0 |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 5,000,000
Shares repurchased (in shares) |  |  | 0 | 0 | 908,000 |
Average price of shares repurchased (in dollars per share) |  |  |  |  | $ 2.52 |
Total purchase price |  |  |  |  | $ 2,300,000 |
Stock repurchase program remaining authorized repurchase amount | 2,700,000 |  |  |  |  |
Preferred Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 3,532,000 |  |  |  |  |
Common stock options exercised |  |  |  |  |  |
Balance, end of period | 3,532,000 |  | $ 3,532,000 |  |  |
Common Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 39,000 |  |  |  |  |
Common stock options exercised |  |  |  |  |  |
Balance, end of period | 39,000 |  | 39,000 |  |  |
Additional Paid-In Capital |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 231,679,000 |  |  |  |  |
Common stock options exercised | 66,000 |  |  |  |  |
Stock-based compensation | 467,000 |  |  |  |  |
Balance, end of period | 232,212,000 |  | 231,679,000 |  |  |
Accumulated Deficit |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (54,837,000) |  |  |  |  |
Net income | 2,875,000 |  |  |  |  |
Balance, end of period | (51,962,000) |  | (54,837,000) |  |  |
Accumulated Other Comprehensive Income |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 3,407,000 |  |  |  |  |
Other comprehensive income | 2,439,000 |  |  |  |  |
Balance, end of period | 5,846,000 |  | 3,407,000 |  |  |
AXT, Inc. Stockholders' Equity |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 183,820,000 |  |  |  |  |
Common stock options exercised | 66,000 |  |  |  |  |
Stock-based compensation | 467,000 |  |  |  |  |
Net income | 2,875,000 |  |  |  |  |
Other comprehensive income | 2,439,000 |  |  |  |  |
Balance, end of period | 189,667,000 |  | 183,820,000 |  |  |
Noncontrolling Interests |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 4,497,000 |  |  |  |  |
Net income | 315,000 |  |  |  |  |
Other comprehensive income | 260,000 |  |  |  |  |
Balance, end of period | $ 5,072,000 |  | $ 4,497,000 |  |  |

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