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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Measurements |
Schedule of assets measured on a recurring basis at fair value |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in thousands)
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposits and time deposits |  | $ | 65,571 |  | $ | — |  | $ | — |  | $ | 65,571
U.S. treasuries |  |  | 3,990 |  |  | — |  |  | — |  |  | 3,990
Total |  | $ | 69,561 |  | $ | — |  | $ | — |  | $ | 69,561
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 37,184 |  | $ | — |  | $ | — |  | $ | 37,184
Corporate debt |  |  | — |  |  | 8,516 |  |  | — |  |  | 8,516
Commercial paper |  |  | — |  |  | 2,489 |  |  | — |  |  | 2,489
Total |  | $ | 37,184 |  | $ | 11,005 |  | $ | — |  | $ | 48,189
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposits and time deposits |  | $ | 64,249 |  | $ | — |  | $ | — |  | $ | 64,249
U.S. treasuries |  |  | 12,490 |  |  | — |  |  | — |  |  | 12,490
Total |  | $ | 76,739 |  | $ | — |  | $ | — |  | $ | 76,739
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 33,895 |  | $ | — |  | $ | — |  | $ | 33,895
Corporate debt |  |  | — |  |  | 10,886 |  |  | — |  |  | 10,886
Commercial paper |  |  | — |  |  | 2,999 |  |  | — |  |  | 2,999
Total |  | $ | 33,895 |  | $ | 13,885 |  | $ | — |  | $ | 47,780

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- Definition Tabular disclosure of assets, 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). + 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 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: 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 + Details
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