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Investments (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Investments in fixed maturity securities as of March 31, 2022 and December 31, 2021 are classified as available-for-sale and are summarized in the table below:
$ in thousandsMarch 31, 2022December 31, 2021
Investment type
Amortized
Cost		Unrealized
(Losses) 		Fair
Value		Amortized
Cost		Unrealized
(Losses) 		Fair
Value
Corporate bonds
$30,154 $(139)$30,015 $32,349 $(17)$32,332 
Commercial paper
81,037 (226)80,811 — — — 
U.S. treasury bills22,358 (31)22,327 — — — 
Total(1)
$133,549 $(396)$133,153 $32,349 $(17)$32,332 
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(1)As of March 31, 2022, approximately $128.3 million have original maturities of ninety-one to 365 days and is disclosed as investments on our Condensed Consolidated Balance Sheets, and approximately $4.9 million of U.S. treasury bills with a maturity over one year is included within other long-term assets on the Condensed Consolidated Balance Sheets. The total balance as of December 31, 2021, have original maturities of ninety-one to 365 days and is disclosed as investments on our Condensed Consolidated Balance Sheets.