Segment Information, Revenue and Enterprise-Wide Disclosures - Schedule of Net Sales by Direct Sales or Distributor and Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	$ 314,446	$ 320,946	$ 304,085	$ 274,512	$ 268,430	$ 285,247	$ 264,224	$ 236,303	$ 1,213,989	$ 1,054,204	$ 942,162
Percentage of net sales									100.00%	100.00%	100.00%
Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 346,997	$ 334,455	$ 322,947
Percentage of net sales									100.00%	100.00%	100.00%
Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 866,992	$ 719,749	$ 619,215
Percentage of net sales									100.00%	100.00%	100.00%
China
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 662,625	$ 593,127	$ 548,048
Percentage of net sales									55.00%	56.00%	58.00%
China | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 226,360	$ 220,390	$ 216,240
Percentage of net sales									65.00%	66.00%	67.00%
China | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 436,265	$ 372,737	$ 331,808
Percentage of net sales									50.00%	52.00%	54.00%
United States
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 120,242	$ 86,277	$ 79,836
Percentage of net sales									10.00%	8.00%	8.00%
United States | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 15,644	$ 16,522	$ 16,237
Percentage of net sales									5.00%	5.00%	5.00%
United States | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 104,598	$ 69,755	$ 63,599
Percentage of net sales									12.00%	10.00%	10.00%
Korea
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 63,960	$ 65,848	$ 60,673
Percentage of net sales									5.00%	6.00%	6.00%
Korea | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 16,562	$ 17,765	$ 16,056
Percentage of net sales									5.00%	5.00%	5.00%
Korea | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 47,398	$ 48,083	$ 44,617
Percentage of net sales									5.00%	7.00%	7.00%
Germany
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 93,714	$ 74,302	$ 61,414
Percentage of net sales									8.00%	7.00%	7.00%
Germany | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 11,770	$ 10,879	$ 11,819
Percentage of net sales									3.00%	3.00%	4.00%
Germany | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 81,944	$ 63,423	$ 49,595
Percentage of net sales									9.00%	9.00%	8.00%
Singapore
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 68,153	$ 58,570	$ 48,464
Percentage of net sales									6.00%	6.00%	5.00%
Singapore | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 2,150	$ 873	$ 943
Percentage of net sales									1.00%
Singapore | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 66,003	$ 57,697	$ 47,521
Percentage of net sales									8.00%	8.00%	8.00%
Taiwan
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 76,344	$ 67,369	$ 59,088
Percentage of net sales									6.00%	6.00%	6.00%
Taiwan | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 2,846	$ 6,327	$ 8,442
Percentage of net sales									1.00%	2.00%	3.00%
Taiwan | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 73,498	$ 61,042	$ 50,646
Percentage of net sales									8.00%	8.00%	8.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 128,951	$ 108,711	$ 84,639
Percentage of net sales									10.00%	11.00%	10.00%
All Others | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 71,665	$ 61,699	$ 53,210
Percentage of net sales									21.00%	19.00%	16.00%
All Others | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales									$ 57,286	$ 47,012	$ 31,429
Percentage of net sales									8.00%	6.00%	5.00%