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Summary of Significant Accounting Policies - Product Revenues, Classified by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues | $ 662 | $ 467 | $ 969 | $ 591 | $ 1,466 | $ 731 | $ 1,126 | $ 1,333 | $ 2,689 | $ 4,656
Concentration risk percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Americas [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 345 | $ 936
Concentration risk percentage |  |  |  |  |  |  |  |  | 13.00% | 20.00%
Japan [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,924 | $ 3,279
Concentration risk percentage |  |  |  |  |  |  |  |  | 71.00% | 71.00%
EMEA [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 344 | $ 379
Concentration risk percentage |  |  |  |  |  |  |  |  | 13.00% | 8.00%
Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 76 | $ 62
Concentration risk percentage |  |  |  |  |  |  |  |  | 3.00% | 1.00%

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