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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Adoption of new accounting standard - ASC 606 |  |  | $ 1,034
Accumulated deficit | $ (38,090) |  | (33,615)
Deferred revenue, current | 0 |  | 1,034
Revenues | 36 | $ 2,432 |
Operating loss | (5,284) | (2,482) |
Net loss | (5,509) | $ (2,652) |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred revenue, current |  |  | 1,034
Revenues | (1,034) |  |
Operating loss | 1,034 |  |
Net loss | 1,034 |  |
Accumulated Deficit |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Adoption of new accounting standard - ASC 606 |  |  | $ 1,034
Net loss | $ (5,509) |  |

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