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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2021
Investments All Other Investments [Abstract] |
Cash Equivalents, Restricted Cash and Short-Term Investments Classified as Available-for-sale Securities | Cash equivalents and investments (debt securities) which are classified as available-for-sale securities, consisted of the following (in thousands):
June 30, 2021 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds (cash equivalents) |  | $ | 73,621 |  |  | $ | — |  |  | $ | — |  |  | $ | 73,621 |
U.S. government agency securities |  |  | 7,778 |  |  |  | 1 |  |  |  | — |  |  |  | 7,779 |
Federal agency securities |  |  | 5,122 |  |  |  | 1 |  |  |  | — |  |  |  | 5,123 |
Total financial assets |  | $ | 86,521 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 86,523 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 73,621 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,902 |
Total financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 86,523 |
December 31, 2020 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds (cash equivalents) |  | $ | 30,360 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,360 |
U.S. government agency securities |  |  | 37,835 |  |  |  | 2 |  |  |  | — |  |  |  | 37,837 |
Federal agency securities |  |  | 13,697 |  |  |  | 3 |  |  |  | — |  |  |  | 13,700 |
Total financial assets |  | $ | 81,892 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 81,897 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 30,360 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,994 |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,543 |
Total financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 81,897 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InvestmentsAllOtherInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration