Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

The following table presents cash, cash equivalents, and restricted cash as reported on the consolidated balance sheets that equal the total amounts on the consolidated statements of cash flows (in thousands):

	June 30,				December 31,
	2017		2016		2016		2015
Cash and cash equivalents	$	78,312	$	74,273	$	51,713	$	55,473
Cash segregated under federal or other regulations	799		2,025		2,355		3,557
Restricted cash included in "Prepaid expenses and other current assets, net"	425		100		250		100
Restricted cash included in "Other long-term assets"	550		700		550		700
Total cash, cash equivalents, and restricted cash	$	80,086	$	77,098	$	54,868	$	59,830