Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 70,744	$ 54,193
Securities owned, at fair value	3,719	66,294
Securities held-to-maturity		1,000
Accounts receivable	27,329	21,309
Income taxes receivable		6,978
Prepaid expenses	6,545	3,550
Other current assets	194	1,007
Total current assets	108,531	154,331
Fixed assets, net	10,028	10,693
Note receivable, net (Note 8)	24,588	18,748
Indemnification receivable (Note 20)	28,339
Securities held-to-maturity	20,229	20,299
Deferred tax assets, net	2,024	1,050
Investments, carried at cost (Note 9)	35,187	35,187
Goodwill (Note 22)	85,856	1,799
Intangible assets (Note 22)	613,227	12,085
Other noncurrent assets	2,428	793
Total assets	930,437	254,985
Current liabilities:
Fund management and administration payable	22,002	20,099
Compensation and benefits payable	13,664	28,053
Deferred consideration - gold payments (Note 11)	11,378
Income taxes payable	1,252
Securities sold, but not yet purchased, at fair value	2,026	950
Accounts payable and other liabilities	9,366	8,246
Total current liabilities	66,721	57,348
Long-term debt (Note 12)	193,407
Deferred consideration - gold payments (Note 11)	151,470
Deferred rent payable	4,608	4,686
Other noncurrent liabilities (Note 20)	28,339
Total liabilities	444,545	62,034
Commitments and Contingencies (Note 14)
Stockholders' equity
Preferred stock, par value $0.01; 2,000 shares authorized:	0	0
Common stock, par value $0.01; 250,000 shares authorized; issued and outstanding: 153,142 and 136,996 at June 30, 2018 and December 31, 2017, respectively	1,531	1,370
Additional paid-in capital	359,066	216,006
Accumulated other comprehensive income	461	291
Accumulated deficit	(7,735)	(24,716)
Total stockholders' equity	353,323	192,951
Total liabilities and stockholders' equity	930,437	$ 254,985
ETFS Capital Limited [Member]
Current liabilities:
Payable to ETFS Capital Limited (Note 3)	7,033
Series A Preferred Stock [Member]
Temporary Equity
Preferred stock - Series A, Non-Voting Convertible, par value $0.01; 14,750 shares authorized, issued and outstanding (Note 13)	$ 132,569