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v3.20.2

Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Cash and Cash Equivalents |  |  |  |  |
Restricted cash | $ 847 | $ 847 | $ 847 | $ 847 | $ 847
Equity Method Investment |  |  |  |  |
Impairment charges |  |  | 0 | 0 |
Cost of Goods and Services Sold | $ 15,478 | $ 26,669 | $ 49,773 | 60,588 |
Cost, Product and Service [Extensible List] | us-gaap:LicenseAndServiceMember | us-gaap:LicenseAndServiceMember |  |  |
Promon |  |  |  |  |
Equity Method Investment |  |  |  |  |
Ownership percentage | 17.00% |  | 17.00% |  |
Cost of Goods and Services Sold | $ 200 | $ 1,200 | $ 1,600 | $ 2,400 |
Amount owed included in accounts payable and accrued liabilities | $ 1,500 |  | $ 1,500 |  |
Letter of Credit |  |  |  |  |
Cash and Cash Equivalents |  |  |  |  |
Restricted Cash, Asset, Statement of Financial Position [Extensible List] | Other Assets, Noncurrent |  | Other Assets, Noncurrent |  | Other Assets, Noncurrent
Restricted cash | $ 800 |  | $ 800 |  |

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