Other Assets and Liabilities - Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Non-Current Liabilities:
Unrecognized tax benefits	$ 3,143	$ 3,143
Guarantee to Deerfield	983	1,053
Other	13	16
Total	$ 4,139	$ 4,212

This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur.

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