Composition of Certain Financial Statement Captions - Changes in Allowance for Doubtful Accounts, Provision for Inventory Reserve and Tax Valuation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts
Allowance for doubtful accounts for inventory reserve and tax valuation
Beginning balance	$ (1,758)	$ (1,446)
Charged to expense	(469)	(665)
Written-off	293	353
Ending balance	(1,934)	(1,758)
Inventory reserve
Allowance for doubtful accounts for inventory reserve and tax valuation
Beginning balance	(2,956)	(6,565)
Charged to expense	(2,349)	(1,915)
Written-off	2,768	5,524
Ending balance	(2,537)	(2,956)
Tax valuation allowance
Allowance for doubtful accounts for inventory reserve and tax valuation
Beginning balance	(154,916)	(142,062)
Charged to expense	(38,340)	(12,854)
Written-off	0	0
Ending balance	$ (193,256)	$ (154,916)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

+ Details

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- Definition

Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

+ References

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- Definition

Amount of decrease in valuation and qualifying accounts and reserves.

+ References

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