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Net Income (loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014
Numerator: [Abstract] |  |  |  |
Net loss attributable to AXT, Inc. | $ (1,024)us-gaap_NetIncomeLoss | $ (2,040)us-gaap_NetIncomeLoss |  |
Less: Preferred stock dividends | (44)us-gaap_PreferredStockDividendsIncomeStatementImpact | (44)us-gaap_PreferredStockDividendsIncomeStatementImpact |  |
Net loss available to common stockholders | (1,068)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (2,084)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |
Denominator: [Abstract] |  |  |  |
Denominator for basic net loss per share - weighted average common shares | 32,553 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,364 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  |
Effect Of Dilutive Securities On Earnings Per Share [Line Items] |  |  |  |
Denominator for dilutive net loss per common share | 32,553 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,364 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  |
Net loss attributable to AXT, Inc. per common share: |  |  |  |
Basic (in dollars per share) | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.06)us-gaap_EarningsPerShareBasic |  |
Diluted (in dollars per share) | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted |  |
Weighted-average shares: [Abstract] |  |  |  |
Preferred stock, shares issued (in shares) | 883 us-gaap_PreferredStockSharesIssued |  |  | 883 us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding (in shares) | 883 us-gaap_PreferredStockSharesOutstanding |  |  | 883 us-gaap_PreferredStockSharesOutstanding
Preferred stock, par value (in dollars per share) | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare |  |  | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, value | $ 3,532 us-gaap_PreferredStockValue |  |  | $ 3,532 us-gaap_PreferredStockValue
Cumulative annual dividend rate (in hundredths) | 5.00%us-gaap_PreferredStockDividendRatePercentage |  | 5.00%us-gaap_PreferredStockDividendRatePercentage |
Liquidation preference over common stock (in dollars per share) | $ 4 us-gaap_PreferredStockLiquidationPreference |  |  | $ 4 us-gaap_PreferredStockLiquidationPreference
Options [Member] |  |  |  |
Weighted-average shares: [Abstract] |  |  |  |
Securities excluded from diluted net loss per share as the impact is anti-dilutive (in shares) | 3,167 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 2,607 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |  |
Restricted Stock Awards [Member] |  |  |  |
Weighted-average shares: [Abstract] |  |  |  |
Securities excluded from diluted net loss per share as the impact is anti-dilutive (in shares) | 261 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember | 241 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember |  |
Common Stock Options [Member] |  |  |  |
Effect Of Dilutive Securities On Earnings Per Share [Line Items] |  |  |  |
Effect of dilutive securities (in shares) | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_EmployeeStockOptionMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_EmployeeStockOptionMember |  |
Restricted Stock Awards [Member] |  |  |  |
Effect Of Dilutive Securities On Earnings Per Share [Line Items] |  |  |  |
Effect of dilutive securities (in shares) | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember |  |

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