Available for Sale Debt Securities (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Summary of Available for Sale Debt Securities

The table below summarizes our available for sale debt securities recorded at fair value as of December 31, 2021 and 2020 (in thousands):


	Cost (1)		Unrealized Gains		Fair Value		Current Assets		Non-Current Assets		Total
As of December 31, 2021
Series A Biohaven Preferred Shares	$	134,068	$	29,432	$	163,500	$	66,000	$	97,500	$	163,500
Series B Biohaven Preferred Shares	70,441		19,759		90,200		—		90,200		90,200
Series B Forwards	—		12,300		12,300		—		12,300		12,300
Development Funding Bond Forward	—		4,400		4,400		—		4,400		4,400
Total available for sale debt securities	$	204,509	$	65,891	$	270,400	$	66,000	$	204,400	$	270,400

As of December 31, 2020
Series A Biohaven Preferred Shares	$	145,647	$	68,753	$	214,400	$	69,984	$	144,416	$	214,400
Series B Forwards	—		18,600		18,600		—		18,600		18,600
Total available for sale debt securities	$	145,647	$	87,353	$	233,000	$	69,984	$	163,016	$	233,000

(1)Cost for Series A Biohaven Preferred Shares represents amortized cost. Cost for Series B Biohaven Preferred Shares represents the amounts paid to purchase the instruments. There were no costs associated with the Series B Forwards and Development Funding Bond Forward.