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Related‑Party Transactions (Details) - Member of the Board of Directors - Consulting services - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |
Related party sales, general and administrative expense | $ 72,000 | $ 0 |
Related party payable | $ 43,000 |  | $ 79,000

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