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Short-term Debt - CTBC (Details)	1 Months Ended
	Jun. 30, 2019 USD ($)	Jan. 31, 2018 USD ($)	May 31, 2017 USD ($)	Apr. 30, 2016	Jun. 30, 2019 TWD ($)	Mar. 31, 2019 USD ($)	Aug. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jan. 31, 2018 TWD ($)	May 31, 2017 TWD ($)	Apr. 01, 2016 USD ($)	Apr. 01, 2016 TWD ($)
Debt Instrument [Line Items]
Total short-term debt						$ 22,660,000		$ 116,181,000
Line of credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total short-term debt						0		93,246,000
CTBC Bank | Term loan | Secured debt
Debt Instrument [Line Items]
Total short-term debt						22,660,000		22,935,000
CTBC Bank | Line of credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total short-term debt						0		$ 25,900,000
Credit facility, unused amount						$ 17,300,000
CTBC Bank | Maximum
Debt Instrument [Line Items]
Interest rate						0.92%		0.95%
CTBC Bank | CTBC Bank
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity											$ 40,000,000
CTBC Bank | CTBC Bank | Term loan | Secured debt
Debt Instrument [Line Items]
Credit facility, term		12 months	12 months	12 months
Credit facility, maximum borrowing capacity		$ 23,600,000	$ 23,000,000						$ 700,000,000.0	$ 700,000,000.0	21,620,000	$ 700,000,000
Collateral amount						$ 26,000,000
CTBC Bank | CTBC Bank | Term loan | Secured debt | Subsequent event
Debt Instrument [Line Items]
Credit facility, term	12 months
Credit facility, maximum borrowing capacity	$ 22,500,000				$ 700,000,000.0
CTBC Bank | CTBC Bank | Term loan | Secured debt | CTBC's Established NTD Interest Rate
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate		0.25%	0.25%	0.25%
CTBC Bank | CTBC Bank | Term loan | Secured debt | CTBC's Established NTD Interest Rate | Subsequent event
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate	0.25%
CTBC Bank | CTBC Bank | Term loan | Customs Bond
Debt Instrument [Line Items]
Credit facility, term			12 months
Credit facility, maximum borrowing capacity			$ 3,300,000							$ 100,000,000.0	$ 3,100,000	$ 100,000,000
Interest rate, stated percentage			0.50%							0.50%	0.50%	0.50%
CTBC Bank | CTBC Bank | Line of credit | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, term				12 months
Credit facility, maximum borrowing capacity			$ 50,000,000.0								$ 40,000,000
Percent of eligible accounts receivable			80.00%							80.00%	80.00%	80.00%
CTBC Bank | CTBC Bank | Line of credit | Revolving Credit Facility | Subsequent event
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 50,000,000.0
CTBC Bank | CTBC Bank | Line of credit | Revolving Credit Facility | CTBC's Established USD Interest Rate
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate				0.30%
CTBC Bank | CTBC Bank | Line of credit | Revolving Credit Facility | CTBC's Established USD Interest Rate | Minimum
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate			0.40%
CTBC Bank | CTBC Bank | Line of credit | Revolving Credit Facility | CTBC's Established USD Interest Rate | Maximum
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate			0.45%
CTBC Bank | CTBC Credit Facility, 12 Month, Up To 0.50% Interest | Term loan | Customs Bond
Debt Instrument [Line Items]
Credit facility, term		12 months
Credit facility, maximum borrowing capacity		$ 3,400,000							$ 100,000,000.0
Interest rate, stated percentage		0.50%							0.50%
CTBC Bank | CTBC Credit Facility, 12 Month, Up To 0.50% Interest | Term loan | Customs Bond | Subsequent event
Debt Instrument [Line Items]
Credit facility, term	12 months
Credit facility, maximum borrowing capacity	$ 3,200,000				$ 100,000,000.0
Interest rate, stated percentage	0.50%				0.50%
CTBC Bank | CTBC Credit Facility, 12 Month, Up To 0.25% Interest | Line of credit | Customs Bond
Debt Instrument [Line Items]
Credit facility, term		12 months
Credit facility, maximum borrowing capacity		$ 50,500,000							$ 1,500,000,000.0
CTBC Bank | CTBC Credit Facility, 12 Month, Up To 0.25% Interest | Line of credit | Customs Bond | CTBC's Established NTD Interest Rate
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate		0.25%
CTBC Bank | CTBC Credit Facility, 180 Day, Up To 100% Of Eligible Accounts Receivable, Between 0.30% And 0.50% Interest | Line of credit | Revolving Credit Facility | Subsequent event
Debt Instrument [Line Items]
Percent of eligible accounts receivable	100.00%				100.00%
CTBC Bank | CTBC Credit Facility, 180 Day, Up To 100% Of Eligible Accounts Receivable, Between 0.30% And 0.50% Interest | Line of credit | Revolving Credit Facility | CTBC's Established USD Interest Rate | Minimum | Subsequent event
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate	0.30%
CTBC Bank | CTBC Credit Facility, 180 Day, Up To 100% Of Eligible Accounts Receivable, Between 0.30% And 0.50% Interest | Line of credit | Revolving Credit Facility | CTBC's Established USD Interest Rate | Maximum | Subsequent event
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate	0.50%
CTBC Bank | CTBC Credit Facility, 180 Day, Up To 100% Of Eligible Accounts Receivable, Between 0.30% And 0.50% Interest | Line of credit | Customs Bond | Subsequent event
Debt Instrument [Line Items]
Credit facility, term	180 days
Credit facility, maximum borrowing capacity	$ 48,200,000				$ 1,500,000,000.0
CTBC Bank | CTBC Credit Facility, 12 Month, Up To 100% Of Eligible Accounts Receivable, Between 0.30% And 0.50% Interest | Term loan | Customs Bond | Subsequent event
Debt Instrument [Line Items]
Credit facility, term	12 months
Percent of eligible accounts receivable	100.00%				100.00%
CTBC Bank | CTBC Credit Facility, 12 Month, Up To 100% Of Eligible Accounts Receivable, Between 0.30% And 0.50% Interest | Line of credit | Revolving Credit Facility | Subsequent event
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 50,000,000.0
CTBC Bank | CTBC Credit Facility, 12 Month, Up To 100% Of Eligible Accounts Receivable, Between 0.30% And 0.50% Interest | Line of credit | Revolving Credit Facility | Minimum | Subsequent event
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate	0.30%
CTBC Bank | CTBC Credit Facility, 12 Month, Up To 100% Of Eligible Accounts Receivable, Between 0.30% And 0.50% Interest | Line of credit | Revolving Credit Facility | Maximum | Subsequent event
Debt Instrument [Line Items]
Credit facility, basis spread on variable rate	0.50%
CTBC Bank | CTBC 2018 Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 50,000,000.0					$ 40,000,000.0

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