Related Parties - Schedule of Sales and Purchases of Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Lite On Semiconductor
Related Party Transaction [Line Items]
Net sales from related parties	$ 304	$ 329	$ 896	$ 1,064
Purchases from related parties	5,208	6,097	16,630	19,258
Nuvoton
Related Party Transaction [Line Items]
Purchases from related parties	2,361	3,202	7,774	9,487
Keylink
Related Party Transaction [Line Items]
Net sales from related parties	4,684	2,690	8,762	6,925
Purchases from related parties	907	1,069	2,646	3,090
JCP
Related Party Transaction [Line Items]
Purchases from related parties	$ 201	$ 322	$ 488	$ 844

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration