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Segment Reporting - Summary of Concentration Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 195,040 | $ 199,469 | $ 162,123 | $ 154,870 | $ 143,855 | $ 148,795 | $ 169,987 | $ 163,267 | $ 711,502 | $ 625,904 | $ 709,598
Customer Concentration Risk [Member] | Asahi Formerly Johnson Matthey [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 341,000 | 213,000 | 124,100
Customer Concentration Risk [Member] | Techemet Metal Trading [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 9,400 | 83,300 | 104,800
Customer Concentration Risk [Member] | Ocean Partners [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 149,700 | 74,800 | 0
Customer Concentration Risk [Member] | RMC [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 71,700 | 132,400
Customer Concentration Risk [Member] | China National Gold [Domain] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 0 | $ 54,100 | $ 137,500
Dore [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 68.00% | 77.00% | 78.00%
Concentrate [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 32.00% | 23.00% | 22.00%

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