XML 31 R21.htm IDEA: XBRL DOCUMENT
v3.19.2

Fair Value Measurement (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Marketable Securities Measured at Fair Value on Recurring Basis | The table below summarizes the fair value of the Company’s marketable securities measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands). There were no other financial assets and liabilities other than discussed above that requires fair value hierarchy measurements and disclosures for the periods presented.
| June 30, 2019
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Marketable securities |  |  |  |  |  |  |
Money market funds[1] | $ | 6,294 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,294 |
U.S. treasury securities | 77,591 |  |  | — |  |  | — |  |  | 77,591 |
Corporate bonds | — |  |  | 19,451 |  |  | — |  |  | 19,451 |
Total marketable securities | $ | 83,885 |  |  | $ | 19,451 |  |  | $ | — |  |  | $ | 103,336 |
| December 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Marketable securities |  |  |  |  |  |  |
Money market funds[1] | $ | 15,223 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,223 |
U.S. treasury securities | 66,489 |  |  | — |  |  | — |  |  | 66,489 |
Corporate bonds | — |  |  | 19,720 |  |  | — |  |  | 19,720 |
Commercial paper | — |  |  | 18,529 |  |  | — |  |  | 18,529 |
Total marketable securities | $ | 81,712 |  |  | $ | 38,249 |  |  | $ | — |  |  | $ | 119,961 |
[1] | Included in cash and cash equivalents on the condensed consolidated balance sheets.

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
Name: | us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration