CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 39,189,000	$ 44,352,000
Short-term investments	15,195,000	20,032,000
Accounts receivable, net of allowances of $515 and $527 as of March 31, 2018 and December 31, 2017	21,347,000	22,778,000
Inventories	51,122,000	45,840,000
Prepaid expenses and other current assets	6,704,000	7,519,000
Total current assets	133,557,000	140,521,000
Long-term investments	12,511,000	12,576,000
Property, plant and equipment, net	58,763,000	46,530,000
Other assets	11,476,000	11,573,000
Total assets	216,307,000	211,200,000
Current liabilities:
Accounts payable	12,049,000	11,445,000
Accrued liabilities	9,190,000	11,149,000
Total current liabilities	21,239,000	22,594,000
Other long-term liabilities	329,000	289,000
Total liabilities	21,568,000	22,883,000
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock Series A, $0.001 par value; 2,000 shares authorized; 883 shares issued and outstanding as of March 31, 2018 and December 31, 2017 (Liquidation preference of $6.9 million and $6.8 million as of March 31, 2018 and December 31, 2017)	3,532,000	3,532,000
Common stock, $0.001 par value; 70,000 shares authorized; 39,438 and 39,413 shares issued and outstanding as of March 31, 2018 and December 31, 2017	39,000	39,000
Additional paid-in capital	232,212,000	231,679,000
Accumulated deficit	(51,962,000)	(54,837,000)
Accumulated other comprehensive income	5,846,000	3,407,000
Total AXT, Inc. stockholders' equity	189,667,000	183,820,000
Noncontrolling interests	5,072,000	4,497,000
Total stockholders' equity	194,739,000	188,317,000
Total liabilities and stockholders' equity	$ 216,307,000	$ 211,200,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.