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Balance Sheet Details - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt securities, impairment losses	$ 0	$ 0
Debt securities, available-for-sale, unrealized gain (loss)	172,000	(77,000)	$ 7,000
Debt securities, available-for-sale, realized gain (loss)	8,000	0	0
Inventory	24,968,000	39,032,000	10,108,000
Depreciation and amortization	2,044,000	1,513,000	$ 1,531,000
Construction in Progress, Gross	13,500,000	10,300,000
SUSTOL
Inventory	1,500,000	6,700,000
Cost of product sales, charges	3,300,000	1,800,000
CINVANTI
Inventory	$ 23,500,000	$ 32,300,000

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

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Nonrecurring impairment charges related to the write-off of production-related equipment and inventory. This tag is used when an Entity charges this cost to cost of goods sold.

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