Supplemental Information - Schedule of Revenues by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 92,062	$ 64,756	$ 252,084	$ 178,395	$ 248,069
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	61,399	44,469	166,937	124,206	168,414
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	24,482	18,295	69,507	50,692	72,485
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	4,779	1,992	12,334	3,497	6,351
Greater China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	1,402	0	3,306	0	819
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 21,688	$ 17,536	$ 64,065	$ 48,545	$ 67,849