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CONCENTRATION OF RISK | 6 Months Ended
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Jun. 30, 2021
Risks And Uncertainties [Abstract] |
CONCENTRATION OF RISK |
16. | CONCENTRATION OF RISK:
Revenues and accounts receivable from the Company's largest customers were as follows (in thousands):
|  | % of Total Revenue for the Three Months Ended June 30, |  |  | % of Total Revenue for the Six Months Ended June 30, |  |  | Accounts Receivable as of |
Customer |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |  |  | June 30, 2021 |
A |  | 51% |  |  | 28% |  |  | 43% |  |  | 36% |  |  | $ | 15,619 |
B |  | 26% |  |  | 34% |  |  | 24% |  |  | 28% |  |  | $ | 38,101 |
C |  | 15% |  |  | 13% |  |  | 18% |  |  | 19% |  |  | $ | 5,955 |
Revenues from outside of North America represented approximately 97% and 93% of consolidated revenue for the three months ended June 30, 2021 and 2020, respectively, and approximately 97% and 96% for the six months ended June 30, 2021 and 2020, respectively. Revenues by geographic area are as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
Country |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
South Korea |  | $ | 86,324 |  |  | $ | 31,062 |  |  | $ | 154,299 |  |  | $ | 100,487 |
China |  |  | 36,308 |  |  |  | 20,508 |  |  |  | 96,812 |  |  |  | 58,342 |
Japan |  |  | 2,001 |  |  |  | 2,197 |  |  |  | 3,316 |  |  |  | 3,984 |
Other non-U.S. locations |  |  | 895 |  |  |  | 315 |  |  |  | 1,720 |  |  |  | 812 |
Total non-U.S. locations |  |  | 125,528 |  |  |  | 54,082 |  |  |  | 256,147 |  |  |  | 163,625 |
United States |  |  | 4,132 |  |  |  | 3,886 |  |  |  | 7,513 |  |  |  | 6,620 |
Total revenue |  | $ | 129,660 |  |  | $ | 57,968 |  |  | $ | 263,660 |  |  | $ | 170,245 |
The Company attributes revenue to different geographic areas on the basis of the location of the customer. Long-lived assets (net), by geographic area are as follows (in thousands):
|  | June 30, 2021 |  |  | December 31, 2020 |
United States |  | $ | 104,692 |  |  | $ | 93,230 |
Other |  |  | 8,495 |  |  |  | 8,883 |
Total long-lived assets |  | $ | 113,187 |  |  | $ | 102,113 |
Substantially all chemical materials were purchased from one supplier. See Note 10.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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