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Investments and Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of Marketable Investments | The Company’s marketable investments have been classified and accounted for as available-for-sale. The Company’s marketable investments as of June 30, 2018 were as follows (in thousands):
|  | June 30, 2018
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Certificates of deposit |  | $ | 4,156 |  |  | $ | 1 |  |  | $ | 0 |  |  | $ | 4,157 |
U.S. treasury |  | 989 |  |  | — |  |  | — |  |  | 989 |
U.S. agency securities and government sponsored securities |  | 94,879 |  |  | 7 |  |  | (16 | ) |  | 94,870 |
Commercial paper |  | 3,131 |  |  | — |  |  | — |  |  | 3,131 |
Corporate bonds |  | 4,994 |  |  | — |  |  | (1 | ) |  | 4,993 |
Total |  | $ | 108,149 |  |  | $ | 8 |  |  | $ | (17 | ) |  | $ | 108,140 |
Schedule of Gross Unrealized Losses and Fair Value of Marketable Investments | The following table presents the gross unrealized losses and the fair value for those marketable investments that were in an unrealized loss position as of June 30, 2018 (in thousands):
|  | June 30, 2018
|  | Less than 12 months
|  | Gross Unrealized Losses |  | Fair Value
Certificates of deposit |  | $ | 0 |  |  | $ | 249 |
U.S. agency securities and government sponsored securities |  | (16 | ) |  | 32,767 |
Corporate bonds |  | (1 | ) |  | 4,993 |
Total |  | $ | (17 | ) |  | $ | 38,009 |
Schedule of Assets Carried at Fair Value | The following table sets forth the Company’s assets measured at fair value by level within the fair value hierarchy (in thousands):
| June 30, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |
Commercial paper | $ | — |  |  | $ | 500 |  |  | $ | — |  |  | $ | 500 |
Money market funds | 75,765 |  |  | — |  |  | — |  |  | 75,765 |
Certificates of deposit | — |  |  | 498 |  |  | — |  |  | 498 |
U.S. agency securities | — |  |  | 35,157 |  |  | — |  |  | 35,157 |
Total cash equivalents | $ | 75,765 |  |  | $ | 36,155 |  |  | $ | — |  |  | $ | 111,920 |
Marketable investments |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 4,157 |  |  | — |  |  | 4,157 |
U.S. treasury | 989 |  |  | — |  |  | — |  |  | 989 |
U.S. agency securities and government sponsored securities | — |  |  | 94,870 |  |  | — |  |  | 94,870 |
Commercial paper | — |  |  | 3,131 |  |  | — |  |  | 3,131 |
Corporate bonds | — |  |  | 4,993 |  |  | — |  |  | 4,993 |
Total marketable investments | $ | 989 |  |  | $ | 107,151 |  |  | $ | — |  |  | $ | 108,140 |
| December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 20,092 |  |  | $ | — |  |  | $ | — |  |  | $ | 20,092 |
Other Assets |  |  |  |  |  |  |
Embedded conversion option held for investment | — |  |  | — |  |  | 984 |  |  | 984 |

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