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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019 | Jul. 01, 2019
Property, Plant and Equipment |  |  |  |  |  |
% of total | 100.00% | 100.00% | 100.00% | 100.00% |  |
Right-of-use operating lease assets | $ 19,696 |  | $ 19,696 |  | $ 0 | $ 16,300
Operating Lease, Liability | $ 19,889 |  | $ 19,889 |  |  | $ 16,300
Accounts Receivable | Five Customers |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |
% of total |  |  | 34.00% |  | 28.00% |

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