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Concentration of Credit Risk and Significant Customers - (Details) | 3 Months Ended
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Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017
Minimum |  |  |
Concentration Risk |  |  |
Terms of credit sales, (in days) | 30 days |  |
Maximum |  |  |
Concentration Risk |  |  |
Terms of credit sales, (in days) | 60 days |  |
Customer A | Sales Revenue, Goods, Net | Customer Concentration Risk |  |  |
Concentration Risk |  |  |
Customers greater than 10% of total | 27.70% |  | 27.50%
Customer A | Accounts Receivable | Customer Concentration Risk |  |  |
Concentration Risk |  |  |
Customers greater than 10% of total | 18.50% | 17.10% |
Customer B | Sales Revenue, Goods, Net | Customer Concentration Risk |  |  |
Concentration Risk |  |  |
Customers greater than 10% of total | 38.00% |  | 33.90%
Customer B | Accounts Receivable | Customer Concentration Risk |  |  |
Concentration Risk |  |  |
Customers greater than 10% of total | 37.90% | 35.50% |
Customer C | Accounts Receivable | Customer Concentration Risk |  |  |
Concentration Risk |  |  |
Customers greater than 10% of total | 10.20% | 10.60% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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