Revenues and Business Information (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of Geographical Distribution of Revenues and Assets

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Revenues:
United States	$	172,168	$	131,306	$	544,407	$	420,412
Europe		30,651		24,939		67,983		63,595
Rest of World		4,904		13,796		35,156		31,441
Total	$	207,723	$	170,041	$	647,546	$	515,448

	September 30,		December 31,
	2018		2017
Assets:
United States	$	685,563	$	519,933
Europe		43,787		83,834
Rest of World		93,669		95,301
Total	$	823,019	$	699,068