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Capital Stock, Other Offerings and Agreements (Details) (USD $) | 12 Months Ended | 1 Months Ended | 11 Months Ended | 12 Months Ended | 11 Months Ended | 12 Months Ended | 1 Months Ended |  |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2009 Registered Direct Offerings [Member] | May 31, 2011 2010 ATM Agreement [Member] | Dec. 31, 2011 2010 ATM Agreement [Member] | Dec. 31, 2011 2011 ATM Agreement [Member] | Dec. 31, 2013 2011 ATM Agreement [Member] | Dec. 31, 2013 Underwritten Offering [Member] | Aug. 31, 2013 Underwritten Offering [Member] | Oct. 31, 2012 Underwritten Offering [Member] | Mar. 31, 2012 Underwritten Offering [Member] | Feb. 28, 2010 Underwritten Offering [Member] | Dec. 18, 2013 Underwritten Offering [Member] | Aug. 23, 2013 Underwritten Offering [Member] | Oct. 29, 2012 Underwritten Offering [Member] | Mar. 09, 2012 Underwritten Offering [Member]
Registered Direct Offerings and Underwritten Offering [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital units issued (in shares) |  |  |  | 695,652 |  |  |  |  |  |  |  |  | 2,800,000 | 10,925,000 | 8,736,187 | 13,333,333 | 29,669,154
Common stock per capital unit (in shares) |  |  |  | 1 |  |  |  |  |  |  |  |  | 1 |  |  |  | 0.5
Common stock per capital unit called by stock warrant (in shares) |  |  |  | 0.5 |  |  |  |  |  |  |  |  | 0.45 |  |  |  |
Gross proceeds from issuance of capital units |  |  |  | $ 12,000,000 |  |  |  |  | $ 57,400,000 | $ 31,600,000 | $ 40,000,000 | $ 39,200,000 | $ 21,000,000 |  |  |  |
Offering expense |  |  |  | 800,000 | 1,000,000 | 100,000 |  |  | 3,800,000 | 2,200,000 | 3,000,000 | 3,000,000 |  |  |  |  |
Purchase price of capital units (in dollars per share) |  |  |  | $ 17.25 |  |  |  |  |  |  |  |  |  | $ 5.25 | $ 3.62 | $ 3.00 | $ 1.32
Number of shares called by warrants (in shares) |  |  |  | 347,826 |  |  |  |  |  |  |  |  |  |  |  |  | 14,834,577
Exercise price of warrants (in dollars per share) |  |  |  | $ 19.50 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.76
Period to purchase additional stock |  |  |  |  |  |  |  |  | 30 days | 30 days | 30 days |  |  |  |  |  |
Term of warrants |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Warrant outstanding (in shares) |  |  |  |  |  |  |  |  | 12,562,682 |  |  |  |  |  |  |  |
ATM Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock sold (in shares) |  |  |  |  | 7,560,862 | 821,386 | 7,572,327 | 0 |  |  |  |  |  |  |  |  |
Sales commission paid per transaction (in hundredths) |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ 84,338,000 | $ 76,498,000 | $ 15,143,000 |  | $ 34,000,000 | $ 4,400,000 | $ 14,600,000 | $ 500,000 |  |  |  |  |  |  |  |  |

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