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CONCENTRATION OF RISK | 9 Months Ended
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Sep. 30, 2019
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 Revenues for the Three Months Ended September 30, |  |  | % of Revenues for the Nine Months Ended September 30, |  |  | Accounts Receivable as of |
Customer |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |  |  | September 30, 2019 |
A |  | 56% |  |  | 50% |  |  | 45% |  |  | 36% |  |  | $ | 21,615 |
B |  | 21% |  |  | 19% |  |  | 24% |  |  | 35% |  |  | $ | 9,820 |
C |  | 12% |  |  | 9% |  |  | 17% |  |  | 8% |  |  | $ | 19,609 |
D |  | 1% |  |  | 10% |  |  | 5% |  |  | 9% |  |  | $ | 444 |
Revenues from outside of North America represented approximately 97% and 96% of consolidated revenue for the three months ended September 30, 2019 and 2018, respectively, and 97% and 95% of consolidated revenue for the nine months ended September 30, 2019 and 2018, respectively. Revenues by geographic area are as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
Country |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
South Korea |  | $ | 70,042 |  |  | $ | 53,883 |  |  | $ | 190,303 |  |  | $ | 126,789 |
China |  |  | 23,205 |  |  |  | 17,037 |  |  |  | 98,955 |  |  |  | 34,368 |
Japan |  |  | 1,137 |  |  |  | 3,076 |  |  |  | 3,802 |  |  |  | 4,637 |
Other non-U.S. locations |  |  | 539 |  |  |  | 457 |  |  |  | 1,718 |  |  |  | 2,078 |
Total non-U.S. locations |  |  | 94,923 |  |  |  | 74,453 |  |  |  | 294,778 |  |  |  | 167,872 |
United States |  |  | 2,592 |  |  |  | 3,097 |  |  |  | 8,670 |  |  |  | 9,399 |
Total revenue |  | $ | 97,515 |  |  | $ | 77,550 |  |  | $ | 303,448 |  |  | $ | 177,271 |
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):
|  | September 30, 2019 |  |  | December 31, 2018 |
United States |  | $ | 79,437 |  |  | $ | 64,560 |
Other |  |  | 6,829 |  |  |  | 5,179 |
Total long-lived assets |  | $ | 86,266 |  |  | $ | 69,739 |
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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