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Investments in Marketable Securities and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available For Sale Securities | The carrying amount, unrealized gain and loss, and fair value of investments in marketable securities by major security type were as follows:
| December 31, 2021 |  |
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | Fair Value Hierarchy
| (In thousands) |  |
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds | $ | 2,357 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,357 |  |  | Level 1
Commercial paper | 2,150 |  |  | — |  |  | — |  |  | 2,150 |  |  | Level 2
Total cash equivalents | 4,507 |  |  | — |  |  | — |  |  | 4,507 |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |
U.S. treasury and agency securities | 269,393 |  |  | — |  |  | (745) |  |  | 268,648 |  |  | Level 2
Commercial paper | 27,187 |  |  | — |  |  | (7) |  |  | 27,180 |  |  | Level 2
Debt securities | 33,366 |  |  | — |  |  | (47) |  |  | 33,319 |  |  | Level 2
Certificates of deposit | 5,000 |  |  | — |  |  | — |  |  | 5,000 |  |  | Level 2
Total marketable securities | 334,946 |  |  | — |  |  | (799) |  |  | 334,147 |  |  |
Restricted cash, non-current: |  |  |  |  |  |  |  |  |
Certificates of deposit | 335 |  |  | — |  |  | — |  |  | 335 |  |  | Level 2
Total | $ | 339,788 |  |  | $ | — |  |  | $ | (799) |  |  | $ | 338,989 |  |  |
| December 31, 2020 |  |
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | Fair Value Hierarchy
| (In thousands) |  |
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds | $ | 24,036 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,036 |  |  | Level 1
Commercial paper | 1,150 |  |  | — |  |  | — |  |  | 1,150 |  |  | Level 2
Total cash equivalents | 25,186 |  |  | — |  |  | — |  |  | 25,186 |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |
U.S. treasury and agency securities | 89,342 |  |  | 5 |  |  | (5) |  |  | 89,342 |  |  | Level 2
Commercial paper | 2,848 |  |  | — |  |  | — |  |  | 2,848 |  |  | Level 2
Debt securities | 17,774 |  |  | — |  |  | (6) |  |  | 17,768 |  |  | Level 2
Certificates of deposit | 673 |  |  | — |  |  | — |  |  | 673 |  |  | Level 2
Total marketable securities | 110,637 |  |  | 5 |  |  | (11) |  |  | 110,631 |  |  |
Total | $ | 135,823 |  |  | $ | 5 |  |  | $ | (11) |  |  | $ | 135,817 |  |  |
The following table summarizes the stated maturities of the Company’s marketable securities:
| December 31, 2021 |  | December 31, 2020 |
| (In thousands) |
Due within one year | $ | 202,895 |  |  | $ | 110,631 |  |
Due after one year through two years | 131,252 |  |  | — |  |
Total marketable securities | $ | 334,147 |  |  | $ | 110,631 |  |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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