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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 97,515 | $ 77,550 | $ 303,448 | $ 177,271
South Korea [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 70,042 | 53,883 | 190,303 | 126,789
China [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 23,205 | 17,037 | 98,955 | 34,368
Japan [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 1,137 | 3,076 | 3,802 | 4,637
Other Non-U.S. Locations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 539 | 457 | 1,718 | 2,078
Total Non-U.S. Locations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 94,923 | 74,453 | 294,778 | 167,872
United States [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 2,592 | $ 3,097 | $ 8,670 | $ 9,399

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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