Marketable Securities and Fair Value Measurements - Summary of Company's Available-for-Sale Securities (Detail) - USD ($) $ in Thousands |
Sep. 30, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Schedule Of Available For Sale Securities [Line Items] | ||
| Cost Basis | $ 114,823 | $ 125,487 |
| Fair Value | 82,816 | 39,633 |
| Fair Value | 2,000 | 1,510 |
| Cash Equivalents - Money Market Funds, Commercial Paper and Corporate Bonds | ||
| Schedule Of Available For Sale Securities [Line Items] | ||
| Cost Basis | 30,080 | 84,361 |
| Unrealized Gain | 0 | 1 |
| Unrealized Loss | 0 | 0 |
| Fair Value | 30,080 | 84,362 |
| Marketable Securities, Current - Commercial Paper, Treasury Bills and Corporate Bonds | ||
| Schedule Of Available For Sale Securities [Line Items] | ||
| Cost Basis | 82,743 | 39,616 |
| Unrealized Gain | 75 | 17 |
| Unrealized Loss | (2) | 0 |
| Fair Value | 82,816 | 39,633 |
| Marketable Securities, Non-current - Treasury Bills | ||
| Schedule Of Available For Sale Securities [Line Items] | ||
| Unrealized Gain | 0 | 0 |
| Unrealized Loss | 0 | 0 |
| Cost Basis | 2,000 | 1,510 |
| Fair Value | $ 2,000 | $ 1,510 |
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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