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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Summary of Categorization of Assets and Liabilities Measured at Fair Value
 
 
December 31, 2018
 
 
 
Total
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Recurring fair value measurements:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash equivalents
 
$
24
 
 
$
24
 
 
$
 
 
$
 
Securities owned, at fair value
 
 
8,873
 
 
 
8,873
 
 
 
 
 
 
 
Total
 
$
8,897
 
 
$
8,897
 
 
$
 
 
$
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-recurring fair value measurements:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Thesys
Series Y preferred stock
(1)
 
$
3,080
 
 
$
 
 
$
 
 
$
3,080
 
Total
 
$
3,080
 
 
$
 
 
$
 
 
$
3,080
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Recurring fair value measurements:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deferred consideration (Note 11)
 
$
161,540
 
 
$
 
 
$
 
 
$
161,540
 
Securities sold, but not yet purchased
 
 
1,698
 
 
 
1,698
 
 
 
 
 
 
 
Total
 
$
163,238
 
 
$
1,698
 
 
$
 
 
$
161,540
 
 
 
 
December 31, 2017
 
 
 
Total
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Recurring fair value measurements:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash equivalents
 
$
26,548
 
 
$
26,548
 
 
$
 
 
$
 
Securities owned, at fair value
 
 
66,294
 
 
 
1,691
 
 
 
64,603
 
 
 
 
Total
 
$
92,842
 
 
$
28,239
 
 
$
64,603
 
 
$
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-recurring fair value measurements:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Thesys
Series Y preferred stock
 
$
6,909
 
 
 
 
 
 
 
 
$
6,909
 
AdvisorEngine
Option
(2)
 
 
3,278
 
 
 
 
 
 
 
 
 
3,278
 
Total
 
$
10,187
 
 
$
 
 
$
 
 
$
10,187
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Recurring fair value measurements:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities sold, but not yet purchased
 
$
950
 
 
$
950
 
 
$
 
 
$
 
Total
 
$
950
 
 
$
950
 
 
$
 
 
$
 
 
  
(1)
Fair value determined on December 31, 2018, which resulted in the recognition of an impairment of $3,829 (See Note 9).
(2)
Fair value determined on December 29, 2017. The Company recognized an impairment of $3,278 on this option upon its expiration (See Note 9).
Summary of Reconciliation of Recurring Fair Value Measurements
The following table presents a reconciliation of beginning and ending balances of recurring fair value measurements classified as Level 3:
 
 
 
Years Ended

December 31,
 
 
 
2018
 
 
2017
 
Deferred consideration (See Note 11)
 
 
 
 
 
 
 
 
Beginning balance
(1)
 
$
172,746
 
 
$
 
Net realized losses/(gains)
(2)
 
 
8,512
 
 
 
 
Net unrealized losses/(gains)
(3)
 
 
(12,220
)
 
 
 
Settlements
 
 
(7,498
)
 
 
 
Ending balance
 
$
161,540
 
 
$
 
  
(1)
Arose in connection with the completion of the ETFS Acquisition on April 11, 2018 (See Note 3).
(2)
Recorded as contractual gold payments expense on the Company’s Consolidated Statements of Operations.
(3)
Recorded as gain on revaluation of deferred consideration on the Company’s Consolidated Statements of Operations.