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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2012 | Jan. 25, 2016
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Sales per share price range |  |  |  |  | $ 5.56
Convertible Debt [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Adjustments to Additional Paid IN capital, Cost and Expenses on Derivative Transaction |  | $ 38.5 |  |  |
Public Offering [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Sales per share price range | $ 7.25 |  |  |  |
Shares sold | 27,758,620 |  |  |  |
Common stock issued upon exercise in full over-allotment granted | 3,620,689 |  |  |  |
Proceeds from shares sold | $ 190.0 |  |  |  |
Offering costs | $ 11.6 |  |  |  |
2012 Sales Agreement [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Sales per share price range |  |  | $ 10.63 |  |
Shares sold |  |  | 1,400,000 |  |
Proceeds from shares sold |  |  | $ 14.6 |  |
Maximum [Member] | 2012 Sales Agreement [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Common stock authorized for issuance under prior shelf registration statement with SEC, dollar amount |  |  |  | $ 50.0 |

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