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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Assets Measured at Fair Value on Recurring Basis
The Company held certain assets that are required to be measured at fair value on a recurring basis as of December 31, 2020, as follows:
  Fair Value Measurement as of December 31, 2020 Using
(in thousands)Total Fair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
U.S. Treasury and government agencies$166,092 $166,092 $— $— 
Corporate debt140,617 — 140,617 — 
Total assets measured at fair value$306,709 $166,092 $140,617 $— 
The Company held certain assets that are required to be measured at fair value on a recurring basis as of December 31, 2019, as follows:
  Fair Value Measurement as of December 31, 2019 Using
(in thousands)Total Fair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
U.S. Treasury and government agencies$88,601 $88,601 $— $— 
Corporate debt137,025 — 137,025 — 
Asset-backed securities48,401 — 48,401 — 
Total assets measured at fair value$274,027 $88,601 $185,426 $—