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Related-Party Transactions - Additional Information (Details) - Kaiser - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |
Revenue recognized | $ 1.0 | $ 0.4 | $ 2.8 | $ 1.8 |
Amounts receivable from transaction | 0.7 |  | 0.7 |  | $ 0.4
Service related expenses | 0.3 | $ 0.1 | 0.5 | $ 0.5 |
Accounts payable and accrued liabilities | $ 0.3 |  | $ 0.3 |  | $ 0.2
Convertible Preferred Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Convertible preferred stock, ownership percentage |  |  |  |  | 6.10%

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