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Summary of Significant Accounting Policies (Schedule of Cumulative Effect on Consolidated Balance Sheet for Adoption of ASC 606) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Prepaid expenses and other current assets | $ 2,035 | $ 2,438 | $ 2,249
Liabilities and Stockholders’ Equity |  |  |
Accumulated deficit | (926,263) | (879,544) | $ (879,733)
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) [Member] |  |  |
Assets |  |  |
Prepaid expenses and other current assets | 223 | 189 |
Liabilities and Stockholders’ Equity |  |  |
Accumulated deficit | $ 223 | $ 189 |

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