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Basis of Presentation and New Accounting Standards (Details) $ / shares in Units, $ in Thousands | May 23, 2018 $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | May 24, 2018 shares | Dec. 31, 2017 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Basis Of Presentation And New Accounting Standards [Line Items] |  |  |  |  |  |
Reverse stock split of common stock | 0.1 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |  | $ 0.001 |  |
Common stock, shares authorized (in shares) | 75,000,000 | 100,000,000 | 100,000,000 | 100,000,000 |  |
Common stock, shares issued (in shares) | 61,600,000 | 6,176,054 | 6,200,000 | 5,782,573 |  |
Common stock, shares outstanding (in shares) | 61,600,000 | 6,176,054 | 6,200,000 | 5,782,573 |  |
Number of shares callable by warrants (in shares) | 23,400,000 |  | 2,300,000 |  |  |
Preferred stock, shares authorized (in shares) | 5,000,000 | 5,000,000 | 5,000,000 | 5,000,000 |  |
Common stock, reverse stock split, fractional shares issued | 0 |  |  |  |  |
Accounting Standards Update No. 2016-18 [Member] |  |  |  |  |  |
Basis Of Presentation And New Accounting Standards [Line Items] |  |  |  |  |  |
Restricted cash | $ |  | $ 40 |  | $ 700 | $ 400 | $ 400
2014 Equity Incentive Plan [Member] |  |  |  |  |  |
Basis Of Presentation And New Accounting Standards [Line Items] |  |  |  |  |  |
Number of shares callable by warrants (in shares) | 9,100,000 |  | 900,000 |  |  |

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