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v2.4.1.9

Income taxes (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current: |  |  |
U.S. State and local | $ (4,890)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | $ 2 us-gaap_CurrentStateAndLocalTaxExpenseBenefit |
Foreign | 197 us-gaap_CurrentForeignTaxExpenseBenefit |  |
Current Income Tax Expense (Benefit), Total | (4,693)us-gaap_CurrentIncomeTaxExpenseBenefit | 2 us-gaap_CurrentIncomeTaxExpenseBenefit |
Reconciliation of the U.S. statutory income tax rate to the entity's effective tax rate |  |  |
Federal income tax (benefit) at statutory rate (as a percent) | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income tax benefit, net of federal benefit (as a percent) | (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 5.65%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 3.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent differences (as a percent) | (0.93%)ptct_EffectiveIncomeTaxRateReconciliationPermanentDifferences | (5.90%)ptct_EffectiveIncomeTaxRateReconciliationPermanentDifferences |
NOL IRC Section 382 Limitations | (21.53%)ptct_EffectiveIncomeTaskRateReconciliationNetOperatingLossesLimitation |  |
Research and development (as a percent) | 3.78%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment | 15.88%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment |
Increase to valuation allowance (as a percent) | 9.17%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (49.63%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (35.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Foreign Taxes | (18.14%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential |  |
Other (as a percent) | 0.01%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments |  | (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate (as a percent) | 4.76%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred tax assets: |  |  |
Amortization | 69 ptct_DeferredTaxAssetsAmortization | 80 ptct_DeferredTaxAssetsAmortization |
Depreciation | 2,268 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 1,922 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |
Accrued expense | 611 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 333 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |
Deferred revenue | 699 us-gaap_DeferredTaxAssetsDeferredIncome | 350 us-gaap_DeferredTaxAssetsDeferredIncome |
Federal tax credits | 17,807 ptct_DeferredTaxAssetsTaxCreditFederal | 14,082 ptct_DeferredTaxAssetsTaxCreditFederal |
State tax credits | 1,274 ptct_DeferredTaxAssetsTaxCreditState | 1,587 ptct_DeferredTaxAssetsTaxCreditState |
Federal net operating losses | 76,933 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 88,188 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |
State net operating losses | 9,185 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 10,457 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |
Capitalized research and development costs | 10,585 ptct_DeferredTaxAssetsDeferredExpenseCapitalizedResearchAndDevelopmentCosts | 12,254 ptct_DeferredTaxAssetsDeferredExpenseCapitalizedResearchAndDevelopmentCosts |
Other | 3,852 us-gaap_DeferredTaxAssetsOther | 3,212 us-gaap_DeferredTaxAssetsOther |
Total gross deferred tax assets | 123,283 us-gaap_DeferredTaxAssetsGross | 132,465 us-gaap_DeferredTaxAssetsGross |
Less valuation allowance | $ 123,283 us-gaap_DeferredTaxAssetsValuationAllowance | $ 132,465 us-gaap_DeferredTaxAssetsValuationAllowance |

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration