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Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 27, 2014 | Feb. 21, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | $ 144,688,000 |  |  |  |  |
Common stock options exercised |  |  |  | 165,000 |  |  |  |  |
Common stock repurchased |  |  |  | (2,254,000) |  |  |  |  |
Stock-based compensation |  |  |  | 1,051,000 |  |  |  |  |
Net (loss) income | $ 47,000 | $ 870,000 | $ 870,000 | (728,000) | $ (404,000) |  |  |  |
Dividends declared by joint ventures |  |  |  | (83,000) |  |  |  |  |
Change in unrealized (loss) gain on marketable securities | (134,000) | (418,000) |  | (484,000) | (279,000) |  |  |  |
Currency translation adjustment |  |  |  | (2,321,000) |  |  |  |  |
Balance, end of period | $ 140,034,000 | 144,688,000 |  | 140,034,000 |  | $ 144,688,000 |  |  |
Reclassification adjustment from AOCI |  |  |  | $ 0 | $ 0 |  |  |  |
Stock Repurchase Program [Abstract] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 5,000,000 | $ 6,000,000
Shares repurchased (in shares) | 308,000 |  |  | 891,000 |  | 0 | 285,000 |  |
Average price of shares repurchased (in dollars per share) | $ 2.38 |  |  | $ 2.53 |  |  | $ 2.51 |  |
Total purchase price | $ 733,000 |  |  | $ 2,300,000 |  |  | $ 716,000 |  |
Stock repurchase program remaining authorized repurchase amount | 2,700,000 |  |  | 2,700,000 |  |  | $ 5,300,000 |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |
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 |  | $ 3,532,000 |  | $ 3,532,000 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | $ 32,000 |  |  |  |  |
Common stock options exercised |  |  |  |  |  |  |  |  |
Balance, end of period | 32,000 | 32,000 |  | $ 32,000 |  | 32,000 |  |  |
Additional Paid In Capital [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | 195,419,000 |  |  |  |  |
Common stock options exercised |  |  |  | 165,000 |  |  |  |  |
Common stock repurchased |  |  |  | (2,254,000) |  |  |  |  |
Stock-based compensation |  |  |  | 1,051,000 |  |  |  |  |
Balance, end of period | 194,381,000 | 195,419,000 |  | 194,381,000 |  | 195,419,000 |  |  |
Accumulated Deficit [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | (68,393,000) |  |  |  |  |
Net (loss) income |  |  |  | (985,000) |  |  |  |  |
Balance, end of period | (69,378,000) | (68,393,000) |  | (69,378,000) |  | (68,393,000) |  |  |
Other Comprehensive Income/(Loss) [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | 7,673,000 |  |  |  |  |
Change in unrealized (loss) gain on marketable securities |  |  |  | (484,000) |  |  |  |  |
Currency translation adjustment |  |  |  | (2,023,000) |  |  |  |  |
Balance, end of period | 5,166,000 | 7,673,000 |  | 5,166,000 |  | 7,673,000 |  |  |
AXT, Inc. Stockholders' Equity [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | 138,263,000 |  |  |  |  |
Common stock options exercised |  |  |  | 165,000 |  |  |  |  |
Common stock repurchased |  |  |  | (2,254,000) |  |  |  |  |
Stock-based compensation |  |  |  | 1,051,000 |  |  |  |  |
Net (loss) income |  |  |  | (985,000) |  |  |  |  |
Dividends declared by joint ventures |  |  |  | 0 |  |  |  |  |
Change in unrealized (loss) gain on marketable securities |  |  |  | (484,000) |  |  |  |  |
Currency translation adjustment |  |  |  | (2,023,000) |  |  |  |  |
Balance, end of period | 133,733,000 | 138,263,000 |  | 133,733,000 |  | 138,263,000 |  |  |
Noncontrolling Interests [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | 6,425,000 |  |  |  |  |
Net (loss) income |  |  |  | 257,000 |  |  |  |  |
Dividends declared by joint ventures |  |  |  | (83,000) |  |  |  |  |
Currency translation adjustment |  |  |  | (298,000) |  |  |  |  |
Balance, end of period | $ 6,301,000 | $ 6,425,000 |  | $ 6,301,000 |  | $ 6,425,000 |  |  |

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