Revenues and Business Information (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Schedule of Geographical Distribution of Revenues and Assets

	Three Months Ended March 31,
	2019		2018
Revenues:
United States	$	122,680	$	178,682
Europe		6,716		23,436
Rest of World		8,387		17,300
Total	$	137,783	$	219,418

	March 31,		December 31,
	2019		2018
Assets:
United States	$	551,623	$	756,053
Europe		38,668		55,064
Rest of World		91,399		103,258
Total	$	681,690	$	914,375