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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 32,553us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,364us-gaap_WeightedAverageNumberOfSharesOutstandingBasic    
Effect Of Dilutive Securities On Earnings Per Share [Line Items]        
Denominator for dilutive net loss per common share 32,553us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,364us-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) 883us-gaap_PreferredStockSharesIssued     883us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding (in shares) 883us-gaap_PreferredStockSharesOutstanding     883us-gaap_PreferredStockSharesOutstanding
Preferred stock, par value (in dollars per share) $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare     $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, value $ 3,532us-gaap_PreferredStockValue     $ 3,532us-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) $ 4us-gaap_PreferredStockLiquidationPreference     $ 4us-gaap_PreferredStockLiquidationPreference
Options [Member]        
Weighted-average shares: [Abstract]        
Securities excluded from diluted net loss per share as the impact is anti-dilutive (in shares) 3,167us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember		 2,607us-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) 261us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember		 241us-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) 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementClassOfStockAxis
= us-gaap_EmployeeStockOptionMember		 0us-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) 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember		 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember