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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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