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Cash Equivalents and Investments (Tables) | 3 Months Ended
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Mar. 31, 2019
Cash Equivalents And Investments [Abstract] |
Schedule of Fair Value of Securities, not Including Cash | The fair value of securities, not including cash at March 31, 2019 and December 31, 2018, were as follows (in thousands):
|  | March 31, 2019 |
|  | Amortized |  |  | Gross Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Money market funds |  | $ | 23,613 |  |  | $ — |  |  | $ — |  |  | $ | 23,613 |
U.S. government securities |  |  | 3,476 |  |  |  | 1 |  |  | — |  |  |  | 3,477 |
Corporate notes |  |  | 11,284 |  |  |  | 2 |  |  | — |  |  |  | 11,286 |
Commercial paper |  |  | 15,744 |  |  | — |  |  | — |  |  |  | 15,744 |
Total available-for-sale marketable debt securities |  | $ | 54,117 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 54,120 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 23,613 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,507 |
Total cash equivalents and investments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 54,120 |
|  | December 31, 2018 |
|  | Amortized |  |  | Gross Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Money market funds |  | $ | 10,606 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,606 |
U.S. government securities |  |  | 9,976 |  |  |  | — |  |  |  | (1 | ) |  |  | 9,975 |
Corporate notes |  |  | 16,514 |  |  |  | 3 |  |  |  | (18 | ) |  |  | 16,499 |
Commercial paper |  |  | 36,331 |  |  |  | — |  |  |  | — |  |  |  | 36,331 |
Total available-for-sale marketable debt securities |  | $ | 73,427 |  |  | $ | 3 |  |  | $ | (19 | ) |  | $ | 73,411 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 15,091 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,320 |
Total cash equivalents and investments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 73,411 |
Schedule of Fair Value of Short-term and Long-term Marketable Securities Classified by Maturity | The following table summarizes the fair value of the Company’s cash equivalents, short-term and long-term marketable securities classified by maturity (in thousands):
|  | March 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Due within one year |  | $ | 54,120 |  |  | $ | 73,411 |
Due after one year through three years |  |  | — |  |  |  | — |
Total available-for-sale marketable debt securities |  | $ | 54,120 |  |  | $ | 73,411 |
Schedule of Available-for-Sale Securities Unrealized Loss Position | The following tables present the Company's available-for-sale securities that were in an unrealized loss position as of March 31, 2019 and December 31, 2018 (in thousands):
|  | As of March 31, 2019 |
|  | Less than 12 months |  |  | 12 Months or Greater |  |  | Total |
Assets |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Corporate notes |  | $ | 2,498 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,498 |  |  | $ | — |
Total |  | $ | 2,498 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,498 |  |  | $ | — |
|  | December 31, 2018 |
|  | Less than 12 months |  |  | 12 Months or Greater |  |  | Total |
Assets |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U.S. government securities |  | $ | 5,977 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 5,977 |  |  | $ | (1 | )
Corporate notes |  |  | 11,521 |  |  |  | (10 | ) |  |  | 2,993 |  |  |  | (8 | ) |  |  | 14,514 |  |  |  | (18 | )
Total |  | $ | 17,498 |  |  | $ | (11 | ) |  | $ | 2,993 |  |  | $ | (8 | ) |  | $ | 20,491 |  |  | $ | (19 | )

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of fair value amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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