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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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	$ 18,225	$ 17,880	$ 34,295	33,919
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Promon
Equity Method Investment
Ownership percentage	17.00%		17.00%
Cost of Goods and Services Sold	$ 100	$ 600	$ 1,400	$ 1,200
Amount owed included in accounts payable and accrued liabilities	$ 2,300		$ 2,300
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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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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