Employee stock purchase plan ESPP compensation expense.

No definition available.

Name:	oled_EmployeeStockPurchasePlanESPPCompensationExpense
Namespace Prefix:	oled_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The maximum percentage of employees' base compensation that can be allocated under the plan.

+ References

No definition available.

+ Details

Name:	oled_EmployeeStockPurchasePlanESPPMaximumAllocationOfBaseCompensation
Namespace Prefix:	oled_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares that may be purchased on a given purchase date, under the plan.

+ References

No definition available.

+ Details

Name:	oled_EmployeeStockPurchasePlanESPPMaximumSharesOnPurchaseDate
Namespace Prefix:	oled_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum value of shares that may be purchased by a single employee during a given calendar year, under the plan.

+ References

No definition available.

+ Details

Name:	oled_EmployeeStockPurchasePlanESPPMaximumValuePerCalendarYear
Namespace Prefix:	oled_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of the lesser of the price per share of common stock on the first day of the purchase period, or the last day of the purchase period, at which eligible employees may purchase shares under the plan.

+ References

No definition available.

+ Details

Name:	oled_EmployeeStockPurchasePlanESPPPercentageOfMarketValue
Namespace Prefix:	oled_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The duration (in consecutive months) of purchase periods as defined by the the plan.

+ References

No definition available.

+ Details

Name:	oled_EmployeeStockPurchasePlanESPPPurchasePeriod
Namespace Prefix:	oled_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Employee stock purchase plan ESPP shares in ESPP.

+ References

No definition available.

+ Details

Name:	oled_EmployeeStockPurchasePlanESPPSharesInESPP
Namespace Prefix:	oled_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section S99
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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STOCK-BASED COMPENSATION - Employee Stock Purchase Plan - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 25, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from common stock issued			$ 564,000
Employee Stock Purchase Plan (ESPP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for issuance (in shares)					1,000,000
Purchase period (in months)			3 months
Percentage of market value (in hundredths)			85.00%
Maximum allocation of base compensation (in hundredths)			10.00%
Maximum shares per purchase date (in shares)			12,500
Maximum value per calendar year, per employee			$ 25,000
Common stock issued (in shares)			5,532	5,928
Proceeds from common stock issued			$ 434,000	$ 349,000
Employee Stock Purchase Plan (ESPP) [Member] \| Selling, General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Charges to expense	$ 24,000	$ 21,000	41,000	36,000
Employee Stock Purchase Plan (ESPP) [Member] \| Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Charges to expense	33,000	23,000	56,000	47,000
Employee Stock Purchase Plan (ESPP) [Member] \| Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Charges to expense	$ 19,000	$ 13,000	$ 33,000	$ 18,000