Revenues and Business Information (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Schedule of Geographical Distribution of Revenues and Assets

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Revenues:
United States	$	193,557	$	150,704	$	372,239	$	289,106
Europe		13,896		16,637		37,332		38,656
Rest of World		12,952		4,808		30,252		17,645
Total	$	220,405	$	172,149	$	439,823	$	345,407

	June 30,		December 31,
	2018		2017
Assets:
United States	$	600,040	$	519,933
Europe		33,765		83,834
Rest of World		93,671		95,301
Total	$	727,476	$	699,068