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Warrants (Schedule of Warrant Activity) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance | 13,216,000 | 14,121,000
Granted | 7,226,000 | 7,978,000
Exercised | (5,402,000) | (8,883,000)
Expired | (190,000) |
Warrants outstanding , Ending balance | 14,850,000 | 13,216,000
September 2013 Warrant [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance | 0 | 0
Granted | 7,044,000 | 0
Exercised | (602,000) | 0
Warrants outstanding , Ending balance | 6,442,000 | 0
Expiration | Sep. 18, 2018 |
December 2012 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance | 7,578,000 | 0
Granted | 0 | 7,578,000
Exercised | (2,661,000) | 0
Warrants outstanding , Ending balance | 4,917,000 | 7,578,000
Expiration | Dec. 31, 2017 |
April 2011 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance | 2,846,000 | 9,470,000
Granted | 0 | 0
Exercised | (1,688,000) | (6,624,000)
Warrants outstanding , Ending balance | 1,158,000 | 2,846,000
Expiration | Apr. 30, 2017 |
March 2011 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance | 361,000 | 2,400,000
Granted | 0 | 0
Exercised | (185,000) | (2,039,000)
Warrants outstanding , Ending balance | 176,000 | 361,000
Expiration | Mar. 31, 2016 |
March 2010 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance | 360,000 | 540,000
Granted | 0 | 0
Exercised | (70,000) | (180,000)
Warrants outstanding , Ending balance | 290,000 | 360,000
Expiration | Mar. 31, 2016 |
August 2009 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance | 978,000 | 978,000
Granted | 0 | 0
Exercised | 0 | 0
Warrants outstanding , Ending balance | 978,000 | 978,000
Expiration | Aug. 31, 2014 |
Consultant Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance | 1,093,000 | 733,000
Granted | 182,000 | 400,000
Exercised | (196,000) | (40,000)
Expired | (190,000) |
Warrants outstanding , Ending balance | 889,000 | 1,093,000
Consultant Warrants [Member] | Minimum [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Expiration | Dec. 31, 2014 |
Consultant Warrants [Member] | Maximum [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Expiration | Dec. 31, 2020 |

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- Definition Class of Warrant or Right, Expired + References No definition available. + Details
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- Details
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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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