Shareholders' Equity (Ordinary Shares/Euro Deferred Shares) (Details)
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12 Months Ended | |||
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Dec. 31, 2014
USD ($)
vote
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Dec. 31, 2014
EUR (€)
vote
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Dec. 31, 2013
USD ($)
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Dec. 31, 2013
EUR (€)
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Equity [Abstract] | ||||
Ordinary shares, number of authorized shares | 100,000,000us-gaap_CommonStockSharesAuthorized | 100,000,000us-gaap_CommonStockSharesAuthorized | 100,000,000us-gaap_CommonStockSharesAuthorized | 100,000,000us-gaap_CommonStockSharesAuthorized |
Ordinary shares, par value (in dollars per share) | $ 0.01us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01us-gaap_CommonStockParOrStatedValuePerShare | ||
Ordinary shares, number of issued shares | 27,388,005us-gaap_CommonStockSharesIssued | 27,388,005us-gaap_CommonStockSharesIssued | 21,856,261us-gaap_CommonStockSharesIssued | 21,856,261us-gaap_CommonStockSharesIssued |
Ordinary shares, number of outstanding shares | 27,388,005us-gaap_CommonStockSharesOutstanding | 27,388,005us-gaap_CommonStockSharesOutstanding | 21,856,261us-gaap_CommonStockSharesOutstanding | 21,856,261us-gaap_CommonStockSharesOutstanding |
Votes per share | 1prta_NumberofVotes | 1prta_NumberofVotes | ||
Euro deferred shares, number of shares authorized | 10,000prta_DeferredSharesSharesAuthorized | 10,000prta_DeferredSharesSharesAuthorized | 10,000prta_DeferredSharesSharesAuthorized | 10,000prta_DeferredSharesSharesAuthorized |
Euro deferred shares, nominal value (in euros per share) | € 22prta_DeferredSharesParValue | € 22prta_DeferredSharesParValue | ||
Euro deferred shares, number of outstanding shares | 0prta_DeferredSharesShareOutstanding | 0prta_DeferredSharesShareOutstanding | 0prta_DeferredSharesShareOutstanding | 0prta_DeferredSharesShareOutstanding |
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- Definition
Deferred Shares Par Value No definition available.
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- Definition
Deferred Shares Share Outstanding No definition available.
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- Definition
Deferred Shares Shares Authorized No definition available.
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- Definition
Number of Votes No definition available.
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- Definition
Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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