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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2020
Fair Value Disclosures [Abstract] |
Summary of valuation of the Company's investments and financial instruments that are measured at fair value on a recurring basis | The following table summarizes the valuation of the Company’s financial instruments that are measured at fair value on a recurring basis:
|  | March 31, 2020 |  | December 31, 2019
|  |  |  | Fair value measurement category |  |  |  | Fair value measurement category
(In thousands) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 32,089 |  |  | 32,089 |  |  | — |  |  | — |  |  | 5,381 |  |  | 5,381 |  |  | — |  |  | — |
Repurchase agreements |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Commercial paper |  | 7,061 |  |  | — |  |  | 7,061 |  |  | — |  |  | 11,892 |  |  | — |  |  | 11,892 |  |  | — |
Corporate notes |  | 14,422 |  |  | — |  |  | 14,422 |  |  | — |  |  | 18,380 |  |  | — |  |  | 18,380 |  |  | — |
U.S. government securities |  | 7,889 |  |  | — |  |  | 7,889 |  |  | — |  |  | 11,295 |  |  | — |  |  | 11,295 |  |  | — |
U.S. asset-backed securities |  | 8,306 |  |  | — |  |  | 8,306 |  |  | — |  |  | 10,509 |  |  | — |  |  | 10,509 |  |  | — |
|  | 69,767 |  |  | 32,089 |  |  | 37,678 |  |  | — |  |  | 57,457 |  |  | 5,381 |  |  | 52,076 |  |  | — |

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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