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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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