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Balance Sheet Details - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt securities, impairment losses | $ 0 | $ 0 |
Debt securities, available-for-sale, unrealized gain (loss) | 172,000 | 172,000 | $ (77,000)
Debt securities, available-for-sale, realized gain (loss) | 0 | 8,000 | 0
Inventory | 41,905,000 | 24,968,000 |
Depreciation and amortization | 2,847,000 | 2,044,000 | $ 1,513,000
Construction in Progress, Gross | 14,100,000 | 13,500,000 |
SUSTOL |  |  |
Inventory | 4,100,000 | 1,500,000 |
Cost of product sales, charges | 100,000 | 3,300,000 |
CINVANTI |  |  |
Inventory | $ 37,800,000 | $ 23,500,000 |

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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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