Revenue Recognition (Revenue by Geographic Region) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue		$ 91,603	$ 70,959	$ 169,691	$ 137,361
United States
Disaggregation of Revenue [Line Items]
Revenue		59,559	41,315	108,109	79,904
Other Americas
Disaggregation of Revenue [Line Items]
Revenue	[1]	3,048	1,883	5,068	4,652
Total Americas
Disaggregation of Revenue [Line Items]
Revenue		62,607	43,198	113,177	84,556
EMEA
Disaggregation of Revenue [Line Items]
Revenue	[2],[3]	19,692	19,911	39,182	38,024
APAC
Disaggregation of Revenue [Line Items]
Revenue	[4]	9,304	7,850	17,332	14,781
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue		12,500	13,000	25,100	24,700
Netherlands
Disaggregation of Revenue [Line Items]
Revenue		$ 600	$ 2,500	$ 1,900	$ 5,000

[1] Canada, Latin America and South America

[2] Europe, the Middle East and Africa (“EMEA”)

[3] Includes revenues from the United Kingdom of $12.5 million and $13.0 million for the three months ended June 30, 2020 and 2019, respectively, and from the Netherlands of $0.6 million and $2.5 million for the three months ended June 30, 2020 and 2019, respectively. Includes revenues from the United Kingdom of $25.1 million and $24.7 million for the six months ended June 30, 2020 and 2019, respectively, and from Netherlands of $1.9 million and $5.0 million for the six months ended June 30, 2020 and 2019, respectively.

[4] Asia-Pacific (“APAC”)