Segment Information and Net Sales - Schedule of Net Sales by Direct Sales or Distributor and Location (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 323,674	$ 320,946	$ 947,973	$ 899,543
Percentage of net sales		100.00%	101.00%	100.00%	100.00%
Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 110,313	$ 93,951	$ 305,602	$ 254,630
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 213,361	$ 226,995	$ 642,371	$ 644,913
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
China
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 163,257	$ 173,228	$ 475,058	$ 487,984
Percentage of net sales		50.00%	54.00%	50.00%	54.00%
China | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 57,952	$ 60,037	$ 169,861	$ 164,109
Percentage of net sales		53.00%	64.00%	56.00%	64.00%
China | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 105,305	$ 113,191	$ 305,197	$ 323,875
Percentage of net sales		49.00%	50.00%	48.00%	50.00%
United States
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 23,111	$ 34,959	$ 87,202	$ 90,947
Percentage of net sales		7.00%	11.00%	9.00%	10.00%
United States | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 2,388	$ 4,409	$ 8,509	$ 12,866
Percentage of net sales		2.00%	5.00%	3.00%	5.00%
United States | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 20,723	$ 30,550	$ 78,693	$ 78,081
Percentage of net sales		10.00%	13.00%	12.00%	12.00%
Korea
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 17,140	$ 17,847	$ 44,897	$ 44,311
Percentage of net sales		5.00%	6.00%	5.00%	5.00%
Korea | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 6,546	$ 4,597	$ 17,309	$ 12,148
Percentage of net sales		6.00%	5.00%	6.00%	5.00%
Korea | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 10,594	$ 13,250	$ 27,588	$ 32,163
Percentage of net sales		5.00%	6.00%	4.00%	5.00%
Germany
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 19,784	$ 23,988	$ 62,891	$ 72,344
Percentage of net sales		6.00%	7.00%	7.00%	8.00%
Germany | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 3,079	$ 3,076	$ 9,536	$ 9,001
Percentage of net sales		3.00%	3.00%	3.00%	4.00%
Germany | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 16,705	$ 20,912	$ 53,355	$ 63,343
Percentage of net sales		8.00%	9.00%	8.00%	10.00%
Singapore
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 16,290	$ 17,616	$ 47,512	$ 53,929
Percentage of net sales		5.00%	5.00%	5.00%	6.00%
Singapore | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 124	$ 637	$ 490	$ 1,549
Percentage of net sales			1.00%		1.00%
Singapore | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 16,166	$ 16,979	$ 47,022	$ 52,380
Percentage of net sales		8.00%	7.00%	7.00%	8.00%
Taiwan
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 22,669	$ 18,296	$ 67,398	$ 55,095
Percentage of net sales		7.00%	6.00%	7.00%	6.00%
Taiwan | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 819	$ 621	$ 1,977	$ 2,399
Percentage of net sales		1.00%	1.00%	1.00%	1.00%
Taiwan | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 21,850	$ 17,675	$ 65,421	$ 52,696
Percentage of net sales		10.00%	8.00%	10.00%	8.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 61,423	$ 35,012	$ 163,015	$ 94,933
Percentage of net sales	[1]	20.00%	11.00%	17.00%	11.00%
All Others | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 39,405	$ 20,574	$ 97,920	$ 52,558
Percentage of net sales	[1]	35.00%	21.00%	31.00%	20.00%
All Others | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 22,018	$ 14,438	$ 65,095	$ 42,375
Percentage of net sales	[1]	10.00%	7.00%	11.00%	7.00%

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