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 labor costs incurred in correcting product failures during the warranty period.

The following table reflects the reserve for warranty activity for the three months ended December 29, 2018 and December 30, 2017:



	Three months ended
(in thousands)	December 29, 2018			December 31, 2017
Reserve for warranty, beginning of period	$	14,475		$	13,796
Provision for warranty	3,086			2,960
Utilization of reserve	(3,160		)	(3,064		)
Reserve for warranty, end of period	$	14,401		$	13,692

Other Commitments and Contingencies

The following table reflects obligations not reflected on the Consolidated Condensed Balance Sheet as of December 29, 2018:



			Payments due by fiscal year
(in thousands)	Total		2019		2020		2021		2022		thereafter
Inventory purchase obligation (1)	$	109,536	$	109,536	$	—	$	—	$	—	$	—
Operating lease obligations (2)	18,027		2,928		3,603		2,340		1,912		7,244
Total	$	127,563	$	112,464	$	3,603	$	2,340	$	1,912	$	7,244


(1)	The Company orders inventory components in the normal course of its business. A portion of these orders are non-cancellable, however, some orders impose varying penalties and charges in the event of cancellation.


(2)	The Company has minimum rental commitments under various leases (excluding taxes, insurance, maintenance and repairs, which are also paid by the Company) primarily for various facility and equipment leases, which expire periodically through 2027 (not including lease extension options, if applicable).

Pursuant to ASC No. 840, Leases, for lessee's involvement in asset construction, the Company was considered the owner of the Building during the construction phase. The Building was completed on December 1, 2013 and Pte signed an agreement with the Landlord to lease from the Landlord approximately 198,000 square feet, representing approximately 70% of the Building. Following the completion of construction, we performed a sale-leaseback analysis pursuant to ASC 840-40 and determined that because of our continuing involvement, ASC 840-40 precluded us from derecognizing the asset and associated financing obligation. As such, we reclassified the asset from construction in progress to property, plant and equipment and began to depreciate the building over its estimated useful life of 25 years. We concluded that the term of the financing obligation is 10 years. This is equal to the non-cancellable term of our lease agreement with the Landlord. As of December 29, 2018, we recorded a financing obligation related to the Building of $15.8 million (see Note 8 above). The financing obligation is not reflected in the table above.

Concentrations

The following table reflects significant customer concentrations as a percentage of net revenue for the three months ended December 29, 2018 and December 30, 2017.



	Three months ended
	December 29, 2018		December 30, 2017
Micron Technology, Inc	18.5	%	*
Haoseng Industrial Company Limited ⁽¹⁾	*		10.9	%
Tesla, Inc	*		10.9	%

(1) Distributor of the Company's products.

* Represented less than 10% of total net revenue

The following table reflects significant customer concentrations as a percentage of total accounts receivable as of December 29, 2018 and December 30, 2017:



	As of
	December 29, 2018		December 30, 2017
Micron Technology, Inc	17.7	%	*
Haoseng Industrial Company Limited ⁽¹⁾	15.5	%	29.6	%
Super Power International ⁽¹⁾	15.4	%	*

(1) Distributor of the Company's products.

* Represented less than 10% of total accounts receivable