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Capital Stock - Summary of Common Stock Warrants Outstanding (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2012 | Feb. 28, 2010
Class Of Warrant Or Right [Line Items] |  |  |  |
Warrant outstanding (in shares) | 18,165,000 | 21,768,000 |  |
Five Year Warrants Issued in February 2010 [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  | $ 10.50
Warrant outstanding (in shares) |  |  |  | 1,260,000
Five Year Warrants Issued in February 2010 [Member] | Warrant Liabilities [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Issuance Date | 2010-02 |  |  |
Expiration Date | 2015-02 |  |  |
Exercise price of warrants (in dollars per share) | $ 10.50 |  |  |
Warrant outstanding (in shares) |  | 1,260,000 |  |
Five Year Warrants Issued in December 2011 [Member] | Stockholders' Equity [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Issuance Date | 2011-12 |  |  |
Expiration Date | 2016-12 |  |  |
Exercise price of warrants (in dollars per share) | $ 1.14 |  |  |
Warrant outstanding (in shares) | 263,000 | 263,000 |  |
Five Year Warrants Issued in March 2012 [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Exercise price of warrants (in dollars per share) |  |  | $ 1.76 |
Warrant outstanding (in shares) | 9,585,153 | 12,109,418 | 14,834,577 |
Five Year Warrants Issued in March 2012 [Member] | Warrant Liabilities [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Issuance Date | 2012-03 |  |  |
Expiration Date | 2017-03 |  |  |
Exercise price of warrants (in dollars per share) | $ 1.76 |  |  |
Warrant outstanding (in shares) | 9,585,000 | 12,109,000 |  |
Five Year Warrants Issued in September 2012 [Member] | Stockholders' Equity [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Issuance Date | 2012-09 |  |  |
Expiration Date | 2017-09 |  |  |
Exercise price of warrants (in dollars per share) | $ 3.54 |  |  |
Warrant outstanding (in shares) | 39,000 | 39,000 |  |
Two Year Warrants Issued in December 2014 [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Exercise price of warrants (in dollars per share) |  | $ 7.90 |  |
Warrant outstanding (in shares) | 8,097,165 | 8,097,165 |  |
Two Year Warrants Issued in December 2014 [Member] | Warrant Liabilities [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Issuance Date | 2014-12 |  |  |
Expiration Date | 2016-12 |  |  |
Exercise price of warrants (in dollars per share) | $ 7.90 |  |  |
Warrant outstanding (in shares) | 8,097,000 | 8,097,000 |  |
Five Year Warrants Issued in February 2015 [Member] | Stockholders' Equity [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Issuance Date | 2015-02 |  |  |
Expiration Date | 2020-02 |  |  |
Exercise price of warrants (in dollars per share) | $ 3.31 |  |  |
Warrant outstanding (in shares) | 181,000 |  |  |

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