Segment Information and Net Sales - Schedule of Net Sales by Direct Sales or Distributor and Location (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 322,006	$ 304,085	$ 624,299	$ 578,597
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 108,713	$ 84,022	$ 195,289	$ 160,679
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 213,293	$ 220,063	$ 429,010	$ 417,918
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
China
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 160,252	$ 166,565	$ 311,801	$ 314,756
Percentage of net sales		50.00%	55.00%	50.00%	54.00%
China | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 59,685	$ 54,747	$ 111,909	$ 104,072
Percentage of net sales		55.00%	65.00%	57.00%	65.00%
China | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 100,567	$ 111,818	$ 199,892	$ 210,684
Percentage of net sales		47.00%	51.00%	47.00%	50.00%
United States
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 30,360	$ 31,203	$ 64,091	$ 55,988
Percentage of net sales		9.00%	10.00%	10.00%	10.00%
United States | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 2,888	$ 4,772	$ 6,121	$ 8,457
Percentage of net sales		3.00%	6.00%	3.00%	5.00%
United States | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 27,472	$ 26,431	$ 57,970	$ 47,531
Percentage of net sales		13.00%	12.00%	14.00%	11.00%
Korea
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 14,459	$ 13,502	$ 27,757	$ 26,464
Percentage of net sales		4.00%	4.00%	4.00%	5.00%
Korea | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 5,625	$ 3,474	$ 10,763	$ 7,551
Percentage of net sales		5.00%	4.00%	6.00%	5.00%
Korea | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 8,834	$ 10,028	$ 16,994	$ 18,913
Percentage of net sales		4.00%	5.00%	4.00%	5.00%
Germany
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 22,563	$ 23,646	$ 43,107	$ 48,356
Percentage of net sales		7.00%	8.00%	7.00%	8.00%
Germany | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 3,429	$ 2,820	$ 6,457	$ 5,925
Percentage of net sales		3.00%	3.00%	3.00%	4.00%
Germany | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 19,134	$ 20,826	$ 36,650	$ 42,431
Percentage of net sales		9.00%	9.00%	9.00%	10.00%
Singapore
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 15,074	$ 20,195	$ 31,222	$ 36,313
Percentage of net sales		5.00%	7.00%	5.00%	6.00%
Singapore | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 154	$ 624	$ 366	$ 912
Percentage of net sales			1.00%		1.00%
Singapore | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 14,920	$ 19,571	$ 30,856	$ 35,401
Percentage of net sales		7.00%	9.00%	7.00%	8.00%
Taiwan
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 21,582	$ 16,750	$ 44,729	$ 36,799
Percentage of net sales		7.00%	6.00%	7.00%	6.00%
Taiwan | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 675	$ 922	$ 1,158	$ 1,778
Percentage of net sales		1.00%	1.00%	1.00%	1.00%
Taiwan | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 20,907	$ 15,828	$ 43,571	$ 35,021
Percentage of net sales		10.00%	7.00%	10.00%	8.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 57,716	$ 32,224	$ 101,592	$ 59,921
Percentage of net sales	[1]	18.00%	10.00%	17.00%	11.00%
All Others | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 36,257	$ 16,663	$ 58,515	$ 31,984
Percentage of net sales	[1]	33.00%	20.00%	30.00%	19.00%
All Others | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 21,459	$ 15,561	$ 43,077	$ 27,937
Percentage of net sales	[1]	10.00%	7.00%	9.00%	8.00%

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