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Stockholders' Equity (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance, beginning of period |  |  | $ 145,546,000 | [1] |  |  |
Common stock options exercised |  |  | 6,000 |  |  |  |
Stock-based compensation |  |  | 589,000 |  |  |  |
Net (loss) income | 561,000 | (1,601,000) | (1,274,000) |  | (3,560,000) |  |
Dividends declared by joint ventures |  |  | (83,000) |  |  |  |
Change in unrealized (loss) gain on marketable securities | 149,000 | (30,000) | 139,000 |  | (47,000) |  |
Currency translation adjustment |  |  | (440,000) |  |  |  |
Balance, end of period | 144,483,000 |  | 144,483,000 |  |  | 145,546,000 | [1]
Stock Repurchase Program [Abstract] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | 6,000,000 |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 0 |  |  | 285,000 |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  | $ 2.51 |
Treasury Stock, Value |  |  |  |  |  | 716,000 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  | 5,300,000 |
Preferred Stock [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance, end of period | 3,532,000 |  | 3,532,000 |  |  | 3,532,000 |
Common Stock [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance, end of period | 32,000 |  | 32,000 |  |  | 32,000 |
Additional Paid In Capital [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance, beginning of period |  |  | 194,156,000 |  |  |  |
Common stock options exercised |  |  | 6,000 |  |  |  |
Stock-based compensation |  |  | 589,000 |  |  |  |
Balance, end of period | 194,751,000 |  | 194,751,000 |  |  |  |
Accumulated Deficit [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance, beginning of period |  |  | (67,005,000) |  |  |  |
Net (loss) income |  |  | (1,721,000) |  |  |  |
Balance, end of period | (68,726,000) |  | (68,726,000) |  |  |  |
Other Comprehensive Income/(loss) [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance, beginning of period |  |  | 8,953,000 |  |  |  |
Change in unrealized (loss) gain on marketable securities |  |  | 139,000 |  |  |  |
Currency translation adjustment |  |  | (370,000) |  |  |  |
Balance, end of period | 8,722,000 |  | 8,722,000 |  |  |  |
AXT, Inc. stockholders equity [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance, beginning of period |  |  | 139,668,000 |  |  |  |
Common stock options exercised |  |  | 6,000 |  |  |  |
Stock-based compensation |  |  | 589,000 |  |  |  |
Net (loss) income |  |  | (1,721,000) |  |  |  |
Change in unrealized (loss) gain on marketable securities |  |  | 139,000 |  |  |  |
Currency translation adjustment |  |  | (370,000) |  |  |  |
Balance, end of period | 138,311,000 |  | 138,311,000 |  |  |  |
Noncontrolling interests [Member] |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance, beginning of period |  |  | 5,878,000 |  |  |  |
Net (loss) income |  |  | 447,000 |  |  |  |
Dividends declared by joint ventures |  |  | (83,000) |  |  |  |
Currency translation adjustment |  |  | (70,000) |  |  |  |
Balance, end of period | $ 6,172,000 |  | $ 6,172,000 |  |  |  |
[1] | Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2013

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