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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Jan. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Proceeds from shares sold | $ 55,239 | $ 42,599 |  |  |
December 2018 Sales Agreement [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Sales per share price range | $ 0.53 |  |  |  |
Shares sold | 33.6 |  |  |  |
Proceeds from shares sold | $ 17,400 |  |  |  |
Shelf Registration Statement, Maximum Authorized Common Stock Issuance, Value |  |  |  | $ 100,000 |
Shelf Registration Statement Remaining Unissued Capital | $ 82,200 |  |  |  |
January 2017 Sales Agreement [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Sales per share price range |  | $ 1.54 |  |  |
Shares sold |  | 6.8 |  |  |
Proceeds from shares sold |  | $ 10,300 |  |  |
Shelf Registration Statement, Maximum Authorized Common Stock Issuance, Value |  |  |  |  | $ 75,000
December 2017 Sales Agreement [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Sales per share price range | $ 0.77 | $ 2.09 |  |  |
Shares sold | 50.3 | 15.7 |  |  |
Proceeds from shares sold | $ 37,900 | $ 32,300 | $ 75,000 |  |

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