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Shareholders' Equity Equity Issuances (Details) - USD ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended | 22 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | May. 01, 2015 | Jun. 30, 2014 | May. 08, 2014 | Mar. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares, issued (shares) |  |  |  |  |  |  |  |  | 5,329,593 |
Proceeds from issuance of common stock |  |  | $ 36,471,269 | $ 16,710,645 | $ 58,736,166 |  |  |  |  |
March 2014 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Other |  |  |  |  |  | 5,100,000 |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 3,000,000 |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 9,400,000 |  |  | $ 20,300,000 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Other |  | 12,500,000 |  |  |  |  |  |  |  |
Fair Value Inputs, Offered Quotes |  | $ 2.00 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | $ 28,800,000 |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Other |  | 1,875,000 |  |  |  |  |  |  |  |
Aspire Capital Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Other | 842,696 |  | 200,000 |  |  |  |  |  |  |
Term Of Agreement In Months | 24 months |  |  |  |  |  |  |  |  |
Discount Applied To Weighted Average Price | 5.00% |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 300,000 |  |  |  |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed | $ 30,000,000 |  |  |  |  |  |  |  |  |
Purchase Commitment, Maximum Amount Committed, Shares | 11,019,276 |  |  |  |  |  |  |  |  |
May 2015 Aspire Capital Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares, issued (shares) |  | 364,837 |  |  |  |  |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed |  |  |  |  |  |  | $ 30,000,000 |  |  | $ 30,000,000
Aspire Capital Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares, issued (shares) |  |  |  |  |  |  |  | 150,000 |  |

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