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Revenue - Cumulative Effect of Changes to Balance Sheet (Details) - USD ($) | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Other accrued liabilities |  | $ 4,893 |
Accumulated deficit | $ (104,267,000) | (102,298) | $ (102,503,000)
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Other accrued liabilities |  |  | 5,098
Accumulated deficit |  |  | $ (102,503)
Adjustments Upon Adoption of ASC 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Other accrued liabilities |  | (205) |
Accumulated deficit |  | $ 205 |

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