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Inventories - Summary of Inventories, Net (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 1,972,460 | $ 2,079,589
Sub-assemblies | 1,546,982 | 2,417,095
Inventory, gross | 3,519,442 | 4,496,684
Less: reserves for obsolete and slow-moving inventories | (163,367) | (800,354)
Inventory, net | $ 3,356,075 | $ 3,696,330

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- Definition Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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