Significant Accounting Policies, Cash, Cash Equivalents and Investments (Details) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2021 USD ($) Company	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Company	Jun. 30, 2020 USD ($)	Dec. 31, 2020 Investment
Cash, Cash Equivalents and Investments [Abstract]
Number of publicly held companies in which there is an equity ownership interest of less than 20% | Company	2		2
Number of privately held companies in which there is an equity ownership interest of less than 20% | Company	7		7
Number of investments in privately held companies that were revalued | Investment					3
Gain on investment	$ 860	$ 9,625	$ 873	$ 9,887
Dynacure [Member]
Cash, Cash Equivalents and Investments [Abstract]
Gain on investment		6,300
Suzhou-Ribo [Member]
Cash, Cash Equivalents and Investments [Abstract]
Gain on investment		3,000
Aro Biotherapeutics [Member]
Cash, Cash Equivalents and Investments [Abstract]
Gain on investment		$ 5,500