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Stockholders' Equity - Summary of Stock Options Granted (Details) (USD $) | 74 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2013 April 16, 2013 [Member] | Jun. 30, 2013 April 17, 2012 [Member] | Jun. 30, 2013 April 19, 2011 [Member] | Jun. 30, 2013 April 20, 2010 [Member] | Jun. 30, 2013 April 21, 2009 [Member] | Jun. 30, 2013 April 15, 2008 [Member] | Jun. 30, 2013 April 17, 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted | 8,100,000 | 205,000 | 1,235,000 | 410,000 | 530,000 | 790,000 | 550,000 | 4,380,000
Option exercise (strike) price |  | $ 54.00 | $ 54.00 | $ 35.00 | $ 30.00 | $ 27.00 | $ 27.00 | $ 22.50
Closing stock price on date of grant |  | $ 49.25 | $ 49.01 | $ 31.78 | $ 27.13 | $ 17.61 | $ 24.35 | $ 20.15
Options outstanding | 4,517,555 | 182,500 | 1,132,500 | 370,000 | 320,000 | 425,800 | 225,900 | 1,860,855
Options vested | 1,496,805 | 0 | 0 | 0 | 0 | 180,800 | 124,650 | 1,191,355

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- Definition As of the balance sheet date, the number of shares into which fully vested stock options outstanding can be converted under the option plan. + References No definition available. + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded. + References No definition available. + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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