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Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 Second Public Offering [Member] | Jun. 30, 2014 Option to purchase additional shares granted to the underwriters [Member] | Sep. 30, 2014 Maximum [Member]
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock authorized for issuance under prior shelf registration statement with SEC, dollar amount |  |  |  | $ 50
Available proceeds under ATM | 15 |  |  |
Shares sold |  | 28,750,000 | 3,750,000 |
Sales per share price range |  | $ 4.00 |  |
Proceeds from shares sold |  | $ 108 |  |

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- Definition Amount per share or per unit assigned to the consideration received of equity securities issued for development stage entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 915 -SubTopic 215 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6472370&loc=d3e38297-110927 + Details
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