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Summary of Significant Accounting Policies (Schedule of Impact of Revenue Standards Adoption on Financial Statements) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Operating expense: |  |  |  |  |  |
Sales, general and administrative | $ 14,943 | $ 15,505 | $ 29,877 | $ 30,770 |  |
Assets |  |  |  |  |  |
Prepaid expenses and other current assets | 2,035 |  | 2,035 |  | $ 2,438 | $ 2,249
Liabilities and Stockholders’ Equity |  |  |  |  |  |
Accumulated deficit | (926,263) |  | (926,263) |  | (879,544) | $ (879,733)
Cash flows from operating activities |  |  |  |  |  |
Net loss | (22,540) | $ (25,539) | (46,719) | (49,406) |  |
Adjustments to reconcile net loss to net cash used in operating activities |  |  |  |  |  |
Prepaid expenses and other assets |  |  | 337 | $ 6,368 |  |
Balances Without Adoption of ASC 606 [Member] |  |  |  |  |  |
Operating expense: |  |  |  |  |  |
Sales, general and administrative | 14,963 |  | 29,912 |  |  |
Assets |  |  |  |  |  |
Prepaid expenses and other current assets | 1,812 |  | 1,812 |  |  |
Liabilities and Stockholders’ Equity |  |  |  |  |  |
Accumulated deficit | (926,040) |  | (926,040) |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net loss |  |  | (46,754) |  |  |
Adjustments to reconcile net loss to net cash used in operating activities |  |  |  |  |  |
Prepaid expenses and other assets |  |  | 302 |  |  |
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) [Member] |  |  |  |  |  |
Operating expense: |  |  |  |  |  |
Sales, general and administrative | (20) |  | (35) |  |  |
Assets |  |  |  |  |  |
Prepaid expenses and other current assets | 223 |  | 223 |  | 189 |
Liabilities and Stockholders’ Equity |  |  |  |  |  |
Accumulated deficit | $ 223 |  | 223 |  | $ 189 |
Cash flows from operating activities |  |  |  |  |  |
Net loss |  |  | 35 |  |  |
Adjustments to reconcile net loss to net cash used in operating activities |  |  |  |  |  |
Prepaid expenses and other assets |  |  | $ 35 |  |  |

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