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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies |
Schedule of changes in product warranty reserves |
|  |  | December 31,
|  | 2018 |  | 2017 |  | 2016
|  |  | (in thousands)
Balance, beginning of the year |  | $ | 6,532 |  | $ | 4,217 |  | $ | 8,159
Warranties issued |  |  | 6,737 |  |  | 5,817 |  |  | 3,916
Addition from Ultratech acquisition |  |  | — |  |  | 1,889 |  |  | —
Consumption of reserves |  |  | (6,573) |  |  | (6,330) |  |  | (6,433)
Changes in estimate |  |  | 1,156 |  |  | 939 |  |  | (1,425)
Balance, end of the year |  | $ | 7,852 |  | $ | 6,532 |  | $ | 4,217
Schedule of future minimum lease payments under non-cancelable operating leases (exclusive of renewal options) | Minimum lease commitments at December 31, 2018 for property and equipment under operating lease agreements (exclusive of renewal options) are payable as follows:
|  | Operating
|  | Leases
|  | (in thousands)
Payments due by period: |  |
2019 |  | $ | 5,143
2020 |  |  | 5,056
2021 |  |  | 2,432
2022 |  |  | 1,812
2023 |  |  | 1,066
Thereafter |  |  | 548
Total |  | $ | 16,057
Schedule of customers who accounted for more than 10% of our aggregate accounts receivable or net sales |
|  | Accounts Receivable |  | Net Sales |
|  | December 31, |  | For the Year Ended December 31, |
Customer |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2016 |
Customer A |  | * |  | 24 | % | * |  | 21 | % | 14 | %
Customer B |  | 22 | % | * |  | * |  | * |  | * |
Customer C |  | * |  | * |  | 12 | % | * |  | * |
*Less than 10% of aggregate accounts receivable or net sales

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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