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Cash, Cash Equivalents and Short-term Investments | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |
Cash, Cash Equivalents and Short-term Investments | Cash, cash equivalents and short-term investments The following tables summarize our cash, cash equivalents and short-term investments as of June 30, 2018 and December 31, 2017 (in thousands):
June 30, 2018 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Cash and money market funds |  | $ | 24,601 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,601 |
Corporate debt |  |  |  |  |  |  |  |  |  |  |  |
Due in one year or less |  | 21,054 |  |  | — |  |  | (8 | ) |  | 21,046 |
U.S. government securities |  |  |  |  |  |  |  |
Due in one year or less |  | 7,982 |  |  | — |  |  | (1 | ) |  | 7,981 |
Total |  | $ | 53,637 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 53,628 |
Reported as: |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 24,601 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,601 |
Short-term investments |  | 29,036 |  |  | — |  |  | (9 | ) |  | 29,027 |
Total |  | $ | 53,637 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 53,628 |
December 31, 2017 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Cash and money market funds |  | $ | 15,703 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,703 |
Corporate debt |  |  |  |  |  |  |  |  |  |  |  |
Due in one year or less |  | 38,053 |  |  | — |  |  | (21 | ) |  | 38,032 |
U.S. government securities |  |  |  |  |  |  |  |
Due in one year or less |  | 13,474 |  |  | — |  |  | (6 | ) |  | 13,468 |
Total |  | $ | 67,230 |  |  | $ | — |  |  | $ | (27 | ) |  | $ | 67,203 |
Reported as: |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 15,703 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,703 |
Short-term investments |  | 51,527 |  |  | — |  |  | (27 | ) |  | 51,500 |
Total |  | $ | 67,230 |  |  | $ | — |  |  | $ | (27 | ) |  | $ | 67,203 |
At June 30, 2018 and December 31, 2017, we held five and ten debt securities that had been in an unrealized loss position for less than 12 months, respectively. At June 30, 2018 and December 31, 2017, the aggregate fair value of the securities in an unrealized loss position for less than 12 months was $10.4 million and $22.9 million, respectively. At June 30, 2018, we did not hold any investments that have been in a continuous unrealized loss position for 12 months or longer. We evaluate our securities for other-than-temporary impairments based on quantitative and qualitative factors, and we considered the decline in market value for the five debt securities in an unrealized loss position as of June 30, 2018, to be primarily attributable to the then current economic and market conditions. We will likely not be required to sell these securities, and do not intend to sell these securities before the recovery of their amortized cost bases, which recovery is expected within the next 12 months. Based on our analysis, we do not consider these investments to be other-than-temporarily impaired as of June 30, 2018. As of June 30, 2018, we held $7.9 million in financial institution debt securities and other corporate debt securities located in Australia, Canada, Luxembourg, Norway and Sweden. As of December 31, 2017, we held $12.0 million in financial institution debt securities and other corporate debt securities located in Australia, Luxembourg, Japan, Norway and Sweden. We had no realized gains or losses on our short-term investments for the three and six months ended June 30, 2018 and 2017. | Cash, Cash Equivalents and Short-term Investments The following tables summarize our cash, cash equivalents and short-term investments as of December 31, 2017 and 2016 (in thousands):
December 31, 2017 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Cash and money market funds | $ | 15,703 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,703 |
Corporate debt securities: |  |  |  |  |  |  |
Due in one year or less | 38,053 |  |  | — |  |  | (21 | ) |  | 38,032 |
U.S. government securities: |  |  |  |  |  |  |
Due in one year or less | 13,474 |  |  | — |  |  | (6 | ) |  | 13,468 |
Total | $ | 67,230 |  |  | $ | — |  |  | $ | (27 | ) |  | $ | 67,203 |
Reported as: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 15,703 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,703 |
Short-term investments | 51,527 |  |  | — |  |  | (27 | ) |  | 51,500 |
Total | $ | 67,230 |  |  | $ | — |  |  | $ | (27 | ) |  | $ | 67,203 |
December 31, 2016 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Cash and money market funds | $ | 43,930 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,930 |
Corporate debt securities: |  |  |  |  |  |  |
Due in one year or less | 48,492 |  |  | 3 |  |  | (29 | ) |  | 48,466 |
U.S. government securities: |  |  |  |  |  |  |
Due in one year or less | 14,013 |  |  | — |  |  | (16 | ) |  | 13,997 |
Due in two years or less | 8,013 |  |  | — |  |  | (18 | ) |  | 7,995 |
Total | $ | 114,448 |  |  | $ | 3 |  |  | $ | (63 | ) |  | $ | 114,388 |
Reported as: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 43,930 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,930 |
Short-term investments | 70,518 |  |  | 3 |  |  | (63 | ) |  | 70,458 |
Total | $ | 114,448 |  |  | $ | 3 |  |  | $ | (63 | ) |  | $ | 114,388 |
At December 31, 2017 and 2016 we held ten and twenty-one debt securities that had been in an unrealized loss position for less than 12 months, respectively. The aggregate fair value of these securities was $22.9 million and $46.6 million at December 31, 2017 and 2016, respectively. As of December 31, 2017, we held one security with a fair value of $5.0 million that had been in a continuous unrealized loss position for greater than 12 months. We evaluated our securities for other-than-temporary impairments based on quantitative and qualitative factors, and we considered the decline in market value for the ten debt securities in an unrealized loss for less than 12 months and the one security in an unrealized loss position greater than 12 months as of December 31, 2017 to be primarily attributable to current economic and market conditions. We will likely not be required to sell these securities, and we do not intend to sell these securities before the recovery of their amortized cost bases, which recovery is expected within the next 12 months. Based on our analysis, we do not consider these investments to be other-than-temporarily impaired as of December 31, 2017 and 2016. As of December 31, 2017, we held $12.0 million in financial institution debt securities and other corporate debt securities located in Australia, Luxembourg, Norway and Sweden. As of December 31, 2016, we held $11.5 million in financial institution debt securities and other corporate debt securities located in Canada, the United Kingdom, New Zealand, Norway and Sweden. We had immaterial unrealized losses on our short-term investments for the year ended December 31, 2017. We had immaterial realized gains on our short-term investments for the years ended December 31, 2016 and 2015.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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