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Business Combination - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 11, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Gain on revaluation of deferred consideration | [1] |  | $ (6,306,000) | $ 7,732,000 | $ (5,939,000) | $ 17,630,000
Acquisition related costs |  |  | $ 190,000 | $ 456,000 | $ 536,000 | 10,446,000
Acquisition of ETFS Business [Member] |  |  |  |  |  |
Gain on revaluation of deferred consideration |  |  |  |  |  | $ 4,670,000
Business acquisition, cash paid |  | $ 253,000,000 |  |  |  |
Business acquisition, number of shares to be issued |  | 30,000,000 |  |  |  |
Business acquisition, number of common shares that the preferred stock is convertible into |  | 14,750,000 |  |  |  |
Acquisition of ETFS Business [Member] | Term Loan Facility [Member] |  |  |  |  |  |
Borrowing under term loan facility |  | $ 200,000,000 |  |  |  |
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Revolving credit facility maximum borrowing capacity |  | $ 50,000,000 |  |  |  |
Acquisition of ETFS Business [Member] | Common Stock [Member] |  |  |  |  |  |
Business acquisition, number of shares to be issued |  | 15,250,000 |  |  |  |
Series A Non-Voting Convertible Preferred Stock [Member] | Acquisition of ETFS Business [Member] |  |  |  |  |  |
Business acquisition, number of shares to be issued |  | 14,750 |  |  |  |
[1] | Gains/(losses) arise due to (decreases)/increases in the forward-looking price of gold and the magnitude of any gain or loss is highly correlated to the magnitude of the change in the forward-looking price of gold. See Note 5 for a reconciliation of changes in the deferred consideration balances.

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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