Segment Information and Net Sales - Schedule of Net Sales by Direct Sales or Distributor and Location (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 302,293	$ 274,512
Percentage of net sales		100.00%	100.00%
Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 86,576	$ 76,656
Percentage of net sales		100.00%	100.00%
Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 215,717	$ 197,856
Percentage of net sales		100.00%	100.00%
China
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 151,549	$ 148,191
Percentage of net sales		50.00%	54.00%
China | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 52,224	$ 49,325
Percentage of net sales		60.00%	64.00%
China | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 99,325	$ 98,866
Percentage of net sales		46.00%	50.00%
United States
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 33,731	$ 24,785
Percentage of net sales		11.00%	9.00%
United States | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 3,233	$ 3,685
Percentage of net sales		4.00%	5.00%
United States | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 30,498	$ 21,100
Percentage of net sales		14.00%	11.00%
Korea
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 13,298	$ 12,962
Percentage of net sales		4.00%	5.00%
Korea | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 5,138	$ 4,077
Percentage of net sales		6.00%	5.00%
Korea | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 8,160	$ 8,885
Percentage of net sales		4.00%	4.00%
Germany
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 20,544	$ 24,710
Percentage of net sales		7.00%	9.00%
Germany | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 3,028	$ 3,105
Percentage of net sales		4.00%	4.00%
Germany | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 17,516	$ 21,605
Percentage of net sales		8.00%	11.00%
Singapore
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 16,148	$ 16,118
Percentage of net sales		5.00%	6.00%
Singapore | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 212	$ 288
Singapore | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 15,936	$ 15,830
Percentage of net sales		7.00%	8.00%
Taiwan
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 23,147	$ 20,049
Percentage of net sales		8.00%	7.00%
Taiwan | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 483	$ 856
Percentage of net sales		1.00%	1.00%
Taiwan | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 22,664	$ 19,193
Percentage of net sales		11.00%	10.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 43,876	$ 27,697
Percentage of net sales	[1]	15.00%	10.00%
All Others | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 22,258	$ 15,320
Percentage of net sales	[1]	25.00%	21.00%
All Others | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 21,618	$ 12,377
Percentage of net sales	[1]	10.00%	6.00%

[1] Represents countries with less than 3% of the total net sales each.