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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of assets measured at fair value on recurring basis | The following tables summarize assets that are measured at fair value on a recurring basis:
| June 30, 2019
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 37,659 |  |  | $ | — |  |  | $ | — |  |  | $ | 37,659 |
Commercial paper | — |  |  | 9,094 |  |  | — |  |  | 9,094 |
| $ | 37,659 |  |  | $ | 9,094 |  |  | $ | — |  |  | $ | 46,753 |
Short-term investments |  |  |  |  |  |  |
Commercial paper | $ | — |  |  | $ | 46,220 |  |  | $ | — |  |  | $ | 46,220 |
Corporate bonds | — |  |  | 20,256 |  |  | — |  |  | 20,256 |
U.S. Treasury and agency obligations | — |  |  | 44,825 |  |  | — |  |  | 44,825 |
| $ | — |  |  | $ | 111,301 |  |  | $ | — |  |  | $ | 111,301 |
| December 31, 2018
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 38,022 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,022 |
| $ | 38,022 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,022 |
Short-term investments |  |  |  |  |  |  |
Commercial paper | $ | — |  |  | $ | 79,634 |  |  | $ | — |  |  | $ | 79,634 |
Corporate bonds | — |  |  | 16,119 |  |  | — |  |  | 16,119 |
U.S. Treasury and agency obligations | — |  |  | 22,366 |  |  | — |  |  | 22,366 |
| $ | — |  |  | $ | 118,119 |  |  | $ | — |  |  | $ | 118,119 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + 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=99377789&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 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 5: 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=99377789&loc=d3e19207-110258 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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