Investments and Fair Value Measurements - Summary of Marketable Securities and Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash equivalents:
Cash equivalents, amortized cost	$ 898,426	$ 779,345
Short-term investments:
Short-term investments, amortized cost	223,201	195,992
Short-term investments, gross unrealized gain	37	6
Short-term investments, gross unrealized loss	(1,033)	(464)
Short-term investments, fair value	222,205	195,534
Amortized Cost	282,445	276,875
Gross Unrealized Gain	38	6
Gross Unrealized Loss	(1,033)	(467)
Fair Value	281,450	276,414
Level 1
Short-term investments:
Short-term investments, fair value	22,440	17,431
Fair Value	63,467	76,384
Level 2
Short-term investments:
Short-term investments, fair value	199,765	178,103
Fair Value	217,983	200,030
U.S. government securities
Short-term investments:
Short-term investments, amortized cost	22,534	17,472
Short-term investments, gross unrealized gain	0	0
Short-term investments, gross unrealized loss	(94)	(41)
Short-term investments, fair value	22,440	17,431
U.S. government securities \| Level 1
Short-term investments:
Short-term investments, fair value	22,440	17,431
U.S. government securities \| Level 2
Short-term investments:
Short-term investments, fair value	0	0
U.S. government agency securities
Short-term investments:
Short-term investments, amortized cost	14,346	11,540
Short-term investments, gross unrealized gain	0	0
Short-term investments, gross unrealized loss	(56)	(30)
Short-term investments, fair value	14,290	11,510
U.S. government agency securities \| Level 1
Short-term investments:
Short-term investments, fair value	0	0
U.S. government agency securities \| Level 2
Short-term investments:
Short-term investments, fair value	2,498	11,510
Municipal bonds
Short-term investments:
Short-term investments, amortized cost	3,548	6,974
Short-term investments, gross unrealized gain	0	2
Short-term investments, gross unrealized loss	(4)	(8)
Short-term investments, fair value	3,544	6,968
Municipal bonds \| Level 1
Short-term investments:
Short-term investments, fair value	0	0
Municipal bonds \| Level 2
Short-term investments:
Short-term investments, fair value	14,290	6,968
Foreign government securities
Short-term investments:
Short-term investments, amortized cost	2,504	7,499
Short-term investments, gross unrealized gain	0	0
Short-term investments, gross unrealized loss	(6)	(27)
Short-term investments, fair value	2,498	7,472
Foreign government securities \| Level 1
Short-term investments:
Short-term investments, fair value	0	0
Foreign government securities \| Level 2
Short-term investments:
Short-term investments, fair value	3,544	7,472
Corporate debt securities
Short-term investments:
Short-term investments, amortized cost	134,003	105,144
Short-term investments, gross unrealized gain	37	3
Short-term investments, gross unrealized loss	(685)	(273)
Short-term investments, fair value	133,355	104,874
Corporate debt securities \| Level 1
Short-term investments:
Short-term investments, fair value	0	0
Corporate debt securities \| Level 2
Short-term investments:
Short-term investments, fair value	133,355	104,874
Commercial paper
Short-term investments:
Short-term investments, amortized cost	12,954	30,798
Short-term investments, gross unrealized gain	0	1
Short-term investments, gross unrealized loss	(4)	(9)
Short-term investments, fair value	12,950	30,790
Commercial paper \| Level 1
Short-term investments:
Short-term investments, fair value	0	0
Commercial paper \| Level 2
Short-term investments:
Short-term investments, fair value	12,950	30,790
Certificates of deposit
Short-term investments:
Short-term investments, amortized cost	1,258	1,255
Short-term investments, gross unrealized gain	0	0
Short-term investments, gross unrealized loss	0	0
Short-term investments, fair value	1,258	1,255
Certificates of deposit \| Level 1
Short-term investments:
Short-term investments, fair value	0	0
Certificates of deposit \| Level 2
Short-term investments:
Short-term investments, fair value	31,870	1,255
Asset-backed securities
Short-term investments:
Short-term investments, amortized cost	32,054	15,310
Short-term investments, gross unrealized gain	0	0
Short-term investments, gross unrealized loss	(184)	(76)
Short-term investments, fair value	31,870	15,234
Asset-backed securities \| Level 1
Short-term investments:
Short-term investments, fair value	0	0
Asset-backed securities \| Level 2
Short-term investments:
Short-term investments, fair value	1,258	15,234
Money market funds
Cash equivalents:
Cash equivalents, amortized cost	41,027	58,953
Cash and cash equivalents, gross unrealized gain	0	0
Cash equivalents, gross unrealized loss	0	0
Cash equivalents, fair value	41,027	58,953
Money market funds \| Level 1
Cash equivalents:
Cash equivalents, fair value	41,027	58,953
Money market funds \| Level 2
Cash equivalents:
Cash equivalents, fair value	0	0
Commercial paper
Cash equivalents:
Cash equivalents, amortized cost	10,436	21,930
Cash and cash equivalents, gross unrealized gain	1	0
Cash equivalents, gross unrealized loss	0	(3)
Cash equivalents, fair value	10,437	21,927
Commercial paper \| Level 1
Cash equivalents:
Cash equivalents, fair value	0	0
Commercial paper \| Level 2
Cash equivalents:
Cash equivalents, fair value	10,437	21,927
Municipal bonds
Cash equivalents:
Cash equivalents, amortized cost	7,781
Cash and cash equivalents, gross unrealized gain	0
Cash equivalents, gross unrealized loss	0
Cash equivalents, fair value	7,781
Municipal bonds \| Level 1
Cash equivalents:
Cash equivalents, fair value	0
Municipal bonds \| Level 2
Cash equivalents:
Cash equivalents, fair value	7,781
Cash equivalents
Cash equivalents:
Cash equivalents, amortized cost	59,244	80,883
Cash and cash equivalents, gross unrealized gain	1	0
Cash equivalents, gross unrealized loss	0	(3)
Cash equivalents, fair value	59,245	80,880
Cash equivalents \| Level 1
Cash equivalents:
Cash equivalents, fair value	41,027	58,953
Cash equivalents \| Level 2
Cash equivalents:
Cash equivalents, fair value	$ 18,218	$ 21,927

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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