Other Investments (Details) - Equity Securities $ in Thousands		6 Months Ended
	Mar. 04, 2019 shares	Jun. 30, 2020 d milestone shares	Jun. 30, 2019 USD ($) shares
Whistler
Debt and Equity Securities, FV-NI [Line Items]
Number of milestones remaining \| milestone		1
Number of shares sold (in shares)	2,563
Shares sold, percentage of shares issued and outstanding	19.00%
Aurora
Debt and Equity Securities, FV-NI [Line Items]
Shares received (in shares)	2,524,341	578,101
Proceeds from sale of equity securities, FV-NI \| $			$ 19,259
Stock issued during period, new issues, measurement input \| d		5
Number of shares sold (in shares)			2,524,341
Canopy
Debt and Equity Securities, FV-NI [Line Items]
Proceeds from sale of equity securities, FV-NI \| $			$ 355
Number of shares sold (in shares)			11,062