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Fair Value Measurements Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Classifications of Fair Value Hierarchy | We classify the inputs used to measure fair value into the following hierarchy:
Level 1 |  | Unadjusted quoted prices in active markets for identical assets or liabilities
Level 2 |  | Unadjusted quoted prices in active markets for similar assets or liabilities, or
|  | Unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or
|  | Inputs other than quoted prices that are observable for the asset or liability
Level 3 |  | Unobservable inputs for the asset or liability
Summary of Financial Assets Measured at Fair Value on a Recurring Basis | The following table is a summary of financial assets measured at fair value on a recurring basis and their classification within the fair value hierarchy (in thousands).
| December 31, 2016 |  | December 31, 2017
| Carrying Value |  | Level 1 |  | Total |  | Carrying Value |  | Level 1 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 57,715 |  |  | $ | 57,715 |  |  | $ | 57,715 |  |  | $ | 35,195 |  |  | $ | 35,195 |  |  | $ | 35,195 |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, used to measure similar assets in prior periods (non-recurring basis) by class of asset or liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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://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 2: 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 Reference 3: 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 + Details
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