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Summary of Significant Accounting Policies - Concentration Risk (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 contract | Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 contract | Jun. 30, 2017 USD ($)
Inventories |  |  |  |  |
Excess and obsolete inventory reserve | $ | $ 3.2 |  | $ 3.2 |  | $ 2.3
Revenue | Customer Concentration Risk |  |  |  |  |
Concentration of revenues |  |  |  |  |
Concentration risk (as a percent) | 10.00% | 9.00% | 10.00% | 10.00% |
Number of customers with concentration | 1 | 1 | 1 | 1 |
Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Concentration of revenues |  |  |  |  |
Concentration risk (as a percent) |  |  | 7.00% |  |
Number of contracts with concentration of risk | 1 |  | 1 |  |

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