Segment and Geographic Information - Schedule of Geographic Revenue Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	$ 117,665	$ 56,567
Total Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage (or more)	100.00%	100.00%
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	$ 51,322	$ 17,232
Japan | Total Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage (or more)	44.00%	31.00%
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	$ 23,136	$ 11,432
U.S. | Total Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage (or more)	20.00%	20.00%
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	$ 27,583	$ 17,503
Korea | Total Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage (or more)	23.00%	31.00%
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	$ 8,846	$ 3,443
China | Total Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage (or more)	7.00%	6.00%
Europe and Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	$ 4,448	$ 4,000
Europe and Middle East | Total Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage (or more)	4.00%	7.00%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	$ 2,330	$ 2,957
Other | Total Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage (or more)	2.00%	5.00%