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Available for Sale Debt Securities (Tables) | 12 Months Ended
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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.

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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