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CASH, CASH EQUIVALENTS AND INVESTMENTS - Additional Information (Details) $ in Millions | Dec. 31, 2020 USD ($) Investment
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Cash And Cash Equivalents [Abstract] |
Number of minority investments | Investment | 1
Minority investment, carrying value | $ | $ 5.0

X
- Definition Minority investment carrying value. + References No definition available. + Details
Name: | oled_MinorityInvestmentCarryingValue
Namespace Prefix: | oled_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of minority investments. + References No definition available. + Details
Name: | oled_NumberOfMinorityInvestments
Namespace Prefix: | oled_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration