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Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | $ 137,390,000 |  |  |  |
Common stock options exercised | 757,000 |  |  |  |
Stock-based compensation | 312,000 |  |  |  |
Issuance of common stock, net of stock issuance costs of $2,246 | 31,918,000 |  |  |  |
Net (loss) income | 425,000 | $ (67,000) |  |  |
Dividends declared by joint ventures | (465,000) |  |  |  |
Other comprehensive income | 352,000 | 327,000 |  |  |
Balance, end of period | 170,689,000 |  | $ 137,390,000 |  |
Reclassification adjustment from AOCI | 0 | $ 0 |  |  |
Stock issuance cost | 2,246,000 |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 5,000,000
Shares repurchased (in shares) |  |  | 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 | 33,000 |  |  |  |
Common stock options exercised | 1,000 |  |  |  |
Issuance of common stock, net of stock issuance costs of $2,246 | 5,000 |  |  |  |
Balance, end of period | 39,000 |  | 33,000 |  |
Additional Paid-In Capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 194,177,000 |  |  |  |
Common stock options exercised | 756,000 |  |  |  |
Stock-based compensation | 312,000 |  |  |  |
Issuance of common stock, net of stock issuance costs of $2,246 | 31,913,000 |  |  |  |
Balance, end of period | 227,158,000 |  | 194,177,000 |  |
Accumulated Deficit |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | (64,985,000) |  |  |  |
Net (loss) income | 665,000 |  |  |  |
Balance, end of period | (64,320,000) |  | (64,985,000) |  |
Other Comprehensive Income |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 253,000 |  |  |  |
Other comprehensive income | 297,000 |  |  |  |
Balance, end of period | 550,000 |  | 253,000 |  |
AXT, Inc. Stockholders' Equity |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 133,010,000 |  |  |  |
Common stock options exercised | 757,000 |  |  |  |
Stock-based compensation | 312,000 |  |  |  |
Issuance of common stock, net of stock issuance costs of $2,246 | 31,918,000 |  |  |  |
Net (loss) income | 665,000 |  |  |  |
Other comprehensive income | 297,000 |  |  |  |
Balance, end of period | 166,959,000 |  | 133,010,000 |  |
Noncontrolling Interests |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 4,380,000 |  |  |  |
Net (loss) income | (240,000) |  |  |  |
Dividends declared by joint ventures | (465,000) |  |  |  |
Other comprehensive income | 55,000 |  |  |  |
Balance, end of period | $ 3,730,000 |  | $ 4,380,000 |  |

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