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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of Fair Value by Significant Investment Category
The following table summarizes the Company’s cash and available-for-sale securities’ amortized cost, unrealized gains (losses), and fair value by significant investment category reported as cash and cash equivalents, restricted cash short-term, restricted cash, or available-for-sale securities as of December 31, 2023 and 2022.
(in thousands)    Reported as:
December 31, 2023Amortized
Cost		Unrealized
Gain		Unrealized
(Loss)		Fair ValueCash & Cash EquivalentsAvailable-for-sale SecuritiesRestricted Cash (Current and Non-Current)
Cash$51,189 $— $— $51,189 $46,829 $— $4,360 
Level I:
Money market funds
40,035 — — 40,035 40,035 — — 
Level II:
Corporate bonds
312,510 718 (378)312,850 — 312,850 — 
U.S. treasury securities
1,020,167 2,344 (544)1,021,967 — 1,021,967 — 
U.S. government agency securities
84,154 14 (96)84,072 — 84,072 — 
Commercial paper
167,989 2 — 167,991 — 167,991 — 
Subtotal
1,584,820 3,078 (1,018)1,586,880 — 1,586,880 — 
Total assets measured at fair value on a recurring basis
$1,676,044 $3,078 $(1,018)$1,678,104 $86,864 $1,586,880 $4,360 
(in thousands)Reported as:
December 31, 2022Amortized
Cost		Unrealized
Gain		Unrealized
(Loss)		Fair ValueCash & Cash EquivalentsAvailable-for-sale SecuritiesRestricted Cash (Current and Non-Current)
Cash$87,719 $— $— $87,719 $77,164 $— $10,555 
Level I:
Money market funds
125,450 — — 125,450 124,979 — 471 
Level II:
Corporate bonds
258,617 46 (2,621)256,042 2,035 254,007 — 
U.S. treasury securities
818,379 20 (9,233)809,166 — 809,166 — 
U.S. government agency securities
25,283 — (31)25,252 — 25,252 — 
Commercial paper
357,334 — — 357,334 — 357,334 — 
Subtotal
1,459,613 66 (11,885)1,447,794 2,035 1,445,759 — 
Total assets measured at fair value on a recurring basis
$1,672,782 $66 $(11,885)$1,660,963 $204,178 $1,445,759 $11,026