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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Loss Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 13,126 us-gaap_NetIncomeLoss | $ 4,284 us-gaap_NetIncomeLoss | $ 20,422 us-gaap_NetIncomeLoss | $ 4,022 us-gaap_NetIncomeLoss | $ 57,886 us-gaap_NetIncomeLoss | [1] | $ 5,542 us-gaap_NetIncomeLoss | $ 15,382 us-gaap_NetIncomeLoss | $ (4,758)us-gaap_NetIncomeLoss | $ 41,854 us-gaap_NetIncomeLoss | $ 74,052 us-gaap_NetIncomeLoss | $ 9,660 us-gaap_NetIncomeLoss
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding - Basic (in shares) |  |  |  |  |  |  |  |  |  | 46,252,960 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 45,898,019 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 45,951,276 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |
Common stock equivalents arising from stock options and ESPP (in shares) |  |  |  |  |  |  |  |  |  | 265,129 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 458,574 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 648,661 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Restricted stock awards and units (in shares) |  |  |  |  |  |  |  |  |  | 167,056 us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends | 187,012 us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends | 283,665 us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends
Weighted average common shares outstanding - Diluted (in shares) |  |  |  |  |  |  |  |  |  | 46,685,145 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 46,543,605 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 46,883,602 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.44 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 1.26 us-gaap_EarningsPerShareBasic |  | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic | $ (0.10)us-gaap_EarningsPerShareBasic | $ 0.90 us-gaap_EarningsPerShareBasic | $ 1.61 us-gaap_EarningsPerShareBasic | $ 0.21 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.44 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 1.24 us-gaap_EarningsPerShareDiluted |  | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ (0.10)us-gaap_EarningsPerShareDiluted | $ 0.90 us-gaap_EarningsPerShareDiluted | $ 1.59 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted
Anti-dilutive shares excluded from the calculation of diluted net loss per common share (in shares) |  |  |  |  |  |  |  |  |  | 87,894 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 140,839 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 212,941 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Deferred revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
License fee agreement, term of agreement (in years) |  |  |  |  |  |  |  |  |  | 6 years 4 months 24 days |  |
Taxes, Other |  |  |  |  |  |  |  |  |  | 4,300 us-gaap_TaxesOther | 178 us-gaap_TaxesOther | 406 us-gaap_TaxesOther
Accounts receivable [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables, current | 0 us-gaap_UnbilledReceivablesCurrent |  |  |  | 92 us-gaap_UnbilledReceivablesCurrent |  |  |  |  | 0 us-gaap_UnbilledReceivablesCurrent | 92 us-gaap_UnbilledReceivablesCurrent |
Research and Development [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Development and operations in the Company’s facilities |  |  |  |  |  |  |  |  |  | 27,891 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | 23,491 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | 21,381 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
PPG OLED Materials Agreement (Note 8) |  |  |  |  |  |  |  |  |  | 10,614 oled_ResearchAndDevelopmentCostsIncurredUnderMaterialsAgreement | 7,470 oled_ResearchAndDevelopmentCostsIncurredUnderMaterialsAgreement | 6,170 oled_ResearchAndDevelopmentCostsIncurredUnderMaterialsAgreement
Costs incurred under sponsored research agreements |  |  |  |  |  |  |  |  |  | 2,014 oled_ResearchAndDevelopmentCostsIncurredUnderSponsoredResearchAgreements | 2,671 oled_ResearchAndDevelopmentCostsIncurredUnderSponsoredResearchAgreements | 2,058 oled_ResearchAndDevelopmentCostsIncurredUnderSponsoredResearchAgreements
Scientific Advisory Board compensation |  |  |  |  |  |  |  |  |  | 635 oled_ScientificAdvisoryBoardCompensation | 583 oled_ScientificAdvisoryBoardCompensation | 423 oled_ScientificAdvisoryBoardCompensation
Research and Development Expense, Total |  |  |  |  |  |  |  |  |  | $ 41,154 us-gaap_ResearchAndDevelopmentExpense | $ 34,215 us-gaap_ResearchAndDevelopmentExpense | $ 30,032 us-gaap_ResearchAndDevelopmentExpense
[1] | During the three months ended December 31, 2013, the Company released income tax valuation allowances of $59.4 million.

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