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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured on Recurring Basis | The following table presents information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):
|  | Fair Value Measurements as of December 31, 2017 |  | Fair Value Measurements as of December 31, 2016
Description |  | Total |  | Level 1 |  | Level 2 |  | Total |  | Level 1 |  | Level 2
Money market funds |  | $ | 49,452 |  | $ | 49,452 |  | $ | — |  | $ | 43,496 |  | $ | 43,496 |  | $ | —
U.S. treasury debt securities |  | 3,075 |  | — |  | 3,075 |  | 3,498 |  | — |  | 3,498
U.S. corporate debt securities |  | 13,289 |  | — |  | 13,289 |  | 7,937 |  | — |  | 7,937
|  | $ | 65,816 |  | $ | 49,452 |  | $ | 16,364 |  | $ | 54,931 |  | $ | 43,496 |  | $ | 11,435
Included in cash and cash equivalents |  | $ | 49,452 |  |  |  |  |  | $ | 43,496 |  |  |  |
Included in marketable securities |  | $ | 16,364 |  |  |  |  |  | $ | 11,435 |  |  |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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