Segment Reporting and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 73,096	$ 60,679
United States [Member]
Segment Reporting Information [Line Items]
Revenues	9,068	9,009
Taiwan [Member]
Segment Reporting Information [Line Items]
Revenues	14,467	13,833
Japan [Member]
Segment Reporting Information [Line Items]
Revenues	4,130	3,208
China [Member]
Segment Reporting Information [Line Items]
Revenues	17,971	14,101
South Korea [Member]
Segment Reporting Information [Line Items]
Revenues	17,230	9,530
Singapore [Member]
Segment Reporting Information [Line Items]
Revenues	4,282	3,266
Other Asia [Member]
Segment Reporting Information [Line Items]
Revenues	1,917	114
Germany [Member]
Segment Reporting Information [Line Items]
Revenues	1,324	3,080
Other Europe [Member]
Segment Reporting Information [Line Items]
Revenues	$ 2,707	$ 4,538