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Inventory - Additional Information (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Inventory on-hand held by Amazon | $ 5.5 | $ 6.1

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- Definition Gross amount of merchandise, goods, commodities, or supplies held by the entity in a building or part of a building for future sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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