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Common and Preferred Stock - Additional Information (Detail) - Entity [Domain] - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014 | Aug. 18, 2010
Class of Stock [Line Items] |  |  |
Common stock loaned under share lending agreement, shares | 9,000,000 | 9,000,000 |
Nominal lending fee | $ 0.01 |  |
Senior convertible notes due August 15, 2015 |  |  |
Class of Stock [Line Items] |  |  |
Principal amount | $ 100,000 | $ 100,000 | $ 100,000

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- Definition Nominal lending fee. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Details
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