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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Measurement [Abstract] |
Cash and Available-for-Sale Securities Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value by Significant Investment Category | The following table shows our cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents of investments available for sale as of December 31, 2018 and 2017 (in thousands):
|  | December 31, 2018 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Investments Available for Sale |
Cash |  | $ | 5,048 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,048 |  |  | $ | 5,048 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 1,107 |  |  |  | — |  |  |  | — |  |  |  | 1,107 |  |  |  | 1,107 |  |  |  | — |
U.S. agency securities |  |  | 3,259 |  |  |  | — |  |  |  | — |  |  |  | 3,259 |  |  |  | 1,456 |  |  |  | 1,803 |
|  |  | 4,366 |  |  |  | — |  |  |  | — |  |  |  | 4,366 |  |  |  | 2,563 |  |  |  | 1,803 |
Total |  | $ | 9,414 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,414 |  |  | $ | 7,611 |  |  | $ | 1,803 |
|  | December 31, 2017 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Investments Available for Sale |
Cash |  | $ | 1,972 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,972 |  |  | $ | 1,972 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 616 |  |  | $ | — |  |  |  | — |  |  |  | 616 |  |  |  | 616 |  |  |  | — |
U.S. agency securities |  |  | 2,001 |  |  | $ | — |  |  |  | (1 | ) |  |  | 2,000 |  |  |  | 547 |  |  |  | 1,453 |
|  |  | 2,617 |  |  | $ | — |  |  |  | (1 | ) |  |  | 2,616 |  |  |  | 1,163 |  |  |  | 1,453 |
Total |  | $ | 4,589 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 4,588 |  |  | $ | 3,135 |  |  | $ | 1,453 |

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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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