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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Notes)
 3 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS 15. COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS
Warranty Expense
The Company’s equipment is generally shipped with a one-year warranty against manufacturing defects. The Company establishes reserves for estimated warranty expense when revenue for the related equipment is recognized. The reserve for estimated warranty expense is based upon historical experience and management’s estimate of future warranty costs, including product part replacement, freight charges and related labor costs expected to be incurred in correcting manufacturing defects during the warranty period.
The following table reflects the reserve for warranty activity for the three months ended December 31, 2022 and January 1, 2022: 
 Three months ended
(in thousands)December 31, 2022January 1, 2022
Reserve for warranty, beginning of period$13,443 $16,961 
Provision for warranty2,100 3,968 
Utilization of reserve(4,122)(3,819)
Reserve for warranty, end of period$11,421 $17,110 
Other Commitments and Contingencies
The following table reflects obligations not reflected on the Consolidated Condensed Balance Sheets as of December 31, 2022:
  Payments due by fiscal year
(in thousands)Total20232024202520262027thereafter
Inventory purchase obligation (1)
$273,139 $153,613 $119,526 $— $— $— $— 
(1)The Company orders inventory components in the normal course of its business. A portion of these orders are non-cancelable and a portion may have varying penalties and charges in the event of cancellation.
From time to time, the Company is party to or the target of lawsuits, claims, investigations and proceedings, including for personal injury, intellectual property, commercial, contract, and employment matters, which are handled and defended in the ordinary course of business. The Company accrues a contingent loss liability for such matters when it is probable that a liability has been incurred and the amount can be reasonably estimated. When a single amount cannot be reasonably estimated but the cost can be estimated within a range, the Company accrues the minimum amount. The Company expenses legal costs, including those expected to be incurred in connection with a loss contingency, as incurred.
Unfunded Capital Commitments
As of December 31, 2022, the Company also has an obligation to fund uncalled capital commitments of approximately $9.6 million, as and when required, in relation to its investment in a private equity fund.
Concentrations
The following table reflects significant customer concentrations as a percentage of net revenue for the three months ended December 31, 2022 and January 1, 2022:
Three months ended
December 31, 2022January 1, 2022
Tianshui Huatian Technology Co., Ltd.*11.2 %
STMicroelectronics N.V.12.8 %*
First Technology China Ltd.11.2 %*
* Represents less than 10% of total net revenue
The following table reflects significant customer concentrations as a percentage of total accounts receivable as of December 31, 2022 and January 1, 2022:
 As of
December 31, 2022January 1, 2022
Tianshui Huatian Technology Co., Ltd.*25.0 %
Haoseng Industrial Co., Ltd. (1)
15.7 %15.6 %
(1)Distributor of the Company's products.
* Represents less than 10% of total accounts receivable