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Investments in Marketable Securities and Fair Value Measurements | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Investments in Marketable Securities and Fair Value Measurements | Investments in Marketable Securities and Fair Value Measurements 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 Company reports its investments in marketable securities at fair value on the consolidated balance sheets based upon the level of judgment associated with inputs used to measure their fair value. The categories are as follows: Level 1—Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities. Level 2—Observable inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices which are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments. Level 3—Unobservable inputs which are supported by little or no market activity and which are significant to the fair value of the assets or liabilities. These inputs are based on the Company’s assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation. 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 |  |
As of December 31, 2021 and December 31, 2020, marketable securities in an unrealized loss position were immaterial, individually and in the aggregate. The Company determines realized gains or losses on the sale of available-for-sale securities on a specific identification method. The Company did not recognize any impairment of marketable securities during the years ended December 31, 2021, 2020 and 2019.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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