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Investments and Fair Value Measurements - Schedule of Assets Carried at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Cash equivalents | $ 111,920 |
Marketable investments | 108,140 |
Level 1 |  |
Assets |  |
Cash equivalents | 75,765 |
Marketable investments | 989 |
Level 2 |  |
Assets |  |
Cash equivalents | 36,155 |
Marketable investments | 107,151 |
Level 3 |  |
Assets |  |
Cash equivalents | 0 |
Marketable investments | 0 |
Embedded conversion option held for investment |  |
Assets |  |
Other Assets |  | $ 984
Embedded conversion option held for investment | Level 1 |  |
Assets |  |
Other Assets |  | 0
Embedded conversion option held for investment | Level 2 |  |
Assets |  |
Other Assets |  | 0
Embedded conversion option held for investment | Level 3 |  |
Assets |  |
Other Assets |  | 984
Commercial paper |  |
Assets |  |
Marketable investments | 3,131 |
Commercial paper | Level 1 |  |
Assets |  |
Marketable investments | 0 |
Commercial paper | Level 2 |  |
Assets |  |
Marketable investments | 3,131 |
Commercial paper | Level 3 |  |
Assets |  |
Marketable investments | 0 |
Certificates of deposit |  |
Assets |  |
Marketable investments | 4,157 |
Certificates of deposit | Level 1 |  |
Assets |  |
Marketable investments | 0 |
Certificates of deposit | Level 2 |  |
Assets |  |
Marketable investments | 4,157 |
Certificates of deposit | Level 3 |  |
Assets |  |
Marketable investments | 0 |
U.S. treasury |  |
Assets |  |
Marketable investments | 989 |
U.S. treasury | Level 1 |  |
Assets |  |
Marketable investments | 989 |
U.S. treasury | Level 2 |  |
Assets |  |
Marketable investments | 0 |
U.S. treasury | Level 3 |  |
Assets |  |
Marketable investments | 0 |
U.S. agency securities and government sponsored securities |  |
Assets |  |
Marketable investments | 94,870 |
U.S. agency securities and government sponsored securities | Level 1 |  |
Assets |  |
Marketable investments | 0 |
U.S. agency securities and government sponsored securities | Level 2 |  |
Assets |  |
Marketable investments | 94,870 |
U.S. agency securities and government sponsored securities | Level 3 |  |
Assets |  |
Marketable investments | 0 |
Corporate bonds |  |
Assets |  |
Marketable investments | 4,993 |
Corporate bonds | Level 1 |  |
Assets |  |
Marketable investments | 0 |
Corporate bonds | Level 2 |  |
Assets |  |
Marketable investments | 4,993 |
Corporate bonds | Level 3 |  |
Assets |  |
Marketable investments | 0 |
Commercial paper |  |
Assets |  |
Cash equivalents | 500 |
Commercial paper | Level 1 |  |
Assets |  |
Cash equivalents | 0 |
Commercial paper | Level 2 |  |
Assets |  |
Cash equivalents | 500 |
Commercial paper | Level 3 |  |
Assets |  |
Cash equivalents | 0 |
Money market funds |  |
Assets |  |
Cash equivalents | 75,765 | 20,092
Money market funds | Level 1 |  |
Assets |  |
Cash equivalents | 75,765 | 20,092
Money market funds | Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Money market funds | Level 3 |  |
Assets |  |
Cash equivalents | 0 | $ 0
Certificates of deposit |  |
Assets |  |
Cash equivalents | 498 |
Certificates of deposit | Level 1 |  |
Assets |  |
Cash equivalents | 0 |
Certificates of deposit | Level 2 |  |
Assets |  |
Cash equivalents | 498 |
Certificates of deposit | Level 3 |  |
Assets |  |
Cash equivalents | 0 |
U.S. treasury |  |
Assets |  |
Cash equivalents | 35,157 |
U.S. treasury | Level 1 |  |
Assets |  |
Cash equivalents | 0 |
U.S. treasury | Level 2 |  |
Assets |  |
Cash equivalents | 35,157 |
U.S. treasury | Level 3 |  |
Assets |  |
Cash equivalents | $ 0 |

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