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Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | $ 367,135 | $ 399,680
Gross Unrealized Gains (Losses) | (30,269) | 1,491
Recorded Basis | 336,866 | 401,171
Investments Current [Member] | Cash and Cash Equivalents [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 29,587 | 13,384
Recorded Basis | 29,587 | 13,384
Investments Current [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 29,587 | 13,384
Recorded Basis | 29,587 | 13,384
Investments Current [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 85,422 | 96,959
Gross Unrealized Gains (Losses) | (8,119) | (196)
Recorded Basis | 77,303 | 96,763
Investments Current [Member] | Investments [Member] | Corporate Bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 39,720 | 41,954
Gross Unrealized Gains (Losses) | (4,739) | (136)
Recorded Basis | 34,981 | 41,818
Investments Current [Member] | Investments [Member] | Asset Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 19,509 | 29,533
Gross Unrealized Gains (Losses) | (806) | (38)
Recorded Basis | 18,703 | 29,495
Investments Current [Member] | Investments [Member] | Mortgage Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 16,753 | 18,089
Gross Unrealized Gains (Losses) | (2,470) | (440)
Recorded Basis | 14,283 | 17,649
Investments Current [Member] | Investments [Member] | U.S. Government Agency Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 7,376 | 7,383
Gross Unrealized Gains (Losses) | (58) | 418
Recorded Basis | 7,318 | 7,801
Investments Current [Member] | Investments [Member] | Emerging Markets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 2,064 |
Gross Unrealized Gains (Losses) | (46) |
Recorded Basis | 2,018 |
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 252,126 | 289,337
Gross Unrealized Gains (Losses) | (22,150) | 1,687
Recorded Basis | 229,976 | 291,024
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Money Market Funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 597 | 528
Recorded Basis | 597 | 528
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Corporate Bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 93,129 | 117,700
Gross Unrealized Gains (Losses) | (9,578) | (17)
Recorded Basis | 83,551 | 117,683
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | U.S. Treasuries [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 66,252 | 67,614
Gross Unrealized Gains (Losses) | (6,774) | (342)
Recorded Basis | 59,478 | 67,272
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Asset Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 51 | 107
Gross Unrealized Gains (Losses) |  | 1
Recorded Basis | 51 | 108
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Mortgage Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 54,255 | 64,217
Gross Unrealized Gains (Losses) | (4,595) | 764
Recorded Basis | 49,660 | 64,981
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | U.S. Government Agency Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 31,857 | 32,898
Gross Unrealized Gains (Losses) | (1,203) | 1,281
Recorded Basis | 30,654 | 34,179
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Mutual Funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 5,985 | 6,273
Recorded Basis | $ 5,985 | $ 6,273

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