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Preferred Shares - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Apr. 11, 2018 | Mar. 31, 2019
Class of Stock [Line Items] |  |
Fair value of preferred stock consideration | $ 132,750 |
Acquisition price per share | $ 9.00 |
Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Other redemption rights unrelated to stockholder approval |  | Temporary equity classification is required for redeemable instruments for which redemption triggers are outside of the issuer's control. ETFS Capital has the right to redeem all the Preferred Shares specified to be converted during the period of time specified in the Certificate of Designations in the event that: (a) the number of shares of the Company's common stock authorized by its certificate of incorporation is insufficient to permit the Company to convert all of the Preferred Shares requested by ETFS Capital to be converted; or (b) ETFS Capital does not, upon completion of a change of control of the Company, receive the same amount per Preferred Share as it would have received had each outstanding Preferred Share been converted into common stock immediately prior to the change of control. However, the Company will not be obligated to make any such redemption payments to the extent such payments would be a breach of any covenant or obligation the Company owes to any of its secured creditors or is otherwise prohibited by applicable law.Any such redemption will be at a price per Preferred Share equal to the dollar volume-weighted average price for a share of common stock for the 30-trading day period ending on the date of such attempted conversion or change of control, as applicable, multiplied by 1,000. Such redemption payment will be made in one payment no later than 10 business days following the last day of the Company's first fiscal quarter that begins on a date following the date ETFS Capital exercises such redemption right.
Acquisition of ETFS Business [Member] |  |
Class of Stock [Line Items] |  |
Shares issued in business acquisition | 30,000,000 |
Acquisition price per share | $ 9.00 |
Acquisition of ETFS Business [Member] | Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Shares issued in business acquisition | 14,750 |
Acquisition of ETFS Business [Member] | Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Shares issued in business acquisition | 15,250,000 |
Common stock equivalents | 14,750,000 |

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