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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2019
Accounting Policies [Abstract] |
Summary of Assets Measured at Fair Value on Recurring Basis | The following table summarizes assets measured at fair value on a recurring basis at March 31, 2019 (in thousands):
|  |  |  |  |  | Active |  |  | Observable |  |  | Unobservable |
|  | March 31, |  |  | Markets |  |  | Inputs |  |  | Inputs |
Description |  | 2019 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Cash |  | $ | 31 |  |  | $ | 31 |  |  | $ | — |  |  | $ | — |
Money market funds (included in cash and cash equivalents) |  |  | 7,150 |  |  |  | 7,150 |  |  |  | — |  |  |  | — |
U.S. treasury securities (included in marketable securities) |  |  | 135,910 |  |  |  | 135,910 |  |  |  | — |  |  |  | — |
Total |  | $ | 143,091 |  |  | $ | 143,091 |  |  | $ | — |  |  | $ | — |
The following table summarizes assets measured at fair value on a recurring basis at December 31, 2018 (in thousands):
|  |  |  |  |  | Active |  |  | Observable |  |  | Unobservable |
|  | December 31, |  |  | Markets |  |  | Inputs |  |  | Inputs |
Description |  | 2018 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Money market funds (included in cash and cash equivalents) |  | $ | 6,804 |  |  | $ | 6,804 |  |  | $ | — |  |  | $ | — |
U.S. treasury securities (included in cash and cash equivalents) |  |  | 238 |  |  |  | 238 |  |  |  | — |  |  |  | — |
U.S. treasury securities (included in marketable securities) |  |  | 100,986 |  |  |  | 100,986 |  |  |  | — |  |  |  | — |
Total |  | $ | 108,028 |  |  | $ | 108,028 |  |  | $ | — |  |  | $ | — |

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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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