CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (495)	$ 4,147	$ 220	$ 11,888
Other comprehensive loss, net of tax:
Change in foreign currency translation loss, net of tax	(4,322)	(3,316)	(4,322)	(5,518)
Change in unrealized gain (loss) on available-for-sale investments, net of tax	(2)	59	78	(18)
Reclassification adjustment for gains included in net loss upon deconsolidation of a subsidiary			(617)
Total other comprehensive loss, net of tax	(4,324)	(3,257)	(4,861)	(5,536)
Comprehensive income (loss)	(4,819)	890	(4,641)	6,352
Less: Comprehensive (income) loss attributable to noncontrolling interests	(189)	31	(1,178)	(890)
Comprehensive income (loss) attributable to AXT, Inc.	$ (5,008)	$ 921	$ (5,819)	$ 5,462