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Subsequent Events - Preferred Shares - Additional Information (Detail) - Acquisition of ETFS Business [Member] - shares
 3 Months Ended
Apr. 11, 2018
Mar. 31, 2018
Subsequent Event [Line Items]    
Convertible preferred stock terms of conversion   As described in the Certificate of Designations, the Company will not issue any shares of common stock upon conversion of the Preferred Shares if the issuance would, together with up to 4,000,000 shares of common stock that the Company may, but is not obligated to, issue prior to December 31, 2018, exceed the aggregate number of shares of common stock that the Company may issue without breaching its obligations under Nasdaq Capital Market Listing Rule 5635(a)(1), unless the Company obtains stockholder approval for the issuance of the Company’s common stock upon conversion of the Preferred Shares in excess of such amount (“Exchange Cap”).
Redemption right for failure to obtain stockholder approval   If stockholder approval for the issuance of the Company’s common stock upon conversion of the Preferred Shares in excess of the Exchange Cap is not obtained by December 31, 2018, ETF Securities will have the right, at its option, to require the Company to redeem the 6,633 Preferred Shares subject to the Exchange Cap during the period ending on the earlier of (a) December 31, 2020 and (b) the date stockholder approval for the issuance of the Company’s common stock upon conversion of the Preferred Shares in excess of the Exchange Cap is obtained. 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 December 31, 2018 multiplied by 1,000. Such redemption payments will be made in 12 equal installments no later than 10 business days following the last day of each of the Company’s 12 fiscal quarters beginning on the day following the date ETF Securities exercises such redemption right.
Other redemption rights unrelated to stockholder approval   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 ETF Securities to be converted; or (b) ETF Securities 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, ETF Securities will have the right, at its option, to require the Company to redeem all the Preferred Shares specified to be converted during the period of time specified in the Certificate of Designations. 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 ETF Securities exercises such redemption right.
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Preferred Shares subject to the Exchange Cap 6,633  
Subsequent Event [Member] | Exchange Cap [Member]    
Subsequent Event [Line Items]    
Common stock issuable upon conversion of Preferred Shares subject to the Exchange Cap 6,633,293  
Subsequent Event [Member] | Minimum [Member]    
Subsequent Event [Line Items]    
Common stock that may be issued prior to December 31, 2018 4,000,000