Investments and Fair Value Measurements - Available-for-sale securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available for sale securities:
Amortized Cost	$ 383,957	$ 274,014
Gross Unrealized Gains	284	148
Gross Unrealized Losses	(4)	(3)
Estimated Fair Value	384,237	274,159
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	59,965	33,644
Estimated Fair Value Total	59,965	33,644
Gross unrealized lesser than 12 months	(3)	(3)
Gross unrealized loss, Total	(3)	(3)
Marketable securities
Available for sale securities:
Amortized Cost	353,320	238,278
Gross Unrealized Gains	284	148
Gross Unrealized Losses	(4)	(3)
Estimated Fair Value	353,600	238,423
US government securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	49,974
Estimated Fair Value Total	49,974
Gross unrealized lesser than 12 months	(1)
Gross unrealized loss, Total	(1)
US government securities \| Level 1
Available for sale securities:
Amortized Cost	189,878	100,746
Gross Unrealized Gains	211	108
Gross Unrealized Losses	(2)
Estimated Fair Value	190,087	100,854
US government agency securities \| Level 2
Available for sale securities:
Amortized Cost	99,877
Gross Unrealized Gains	37
Estimated Fair Value	99,914
Corporate notes
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months		5,507
Estimated Fair Value Total		5,507
Gross unrealized lesser than 12 months		(1)
Gross unrealized loss, Total		(1)
Corporate notes \| Level 2
Available for sale securities:
Amortized Cost	2,616	25,466
Gross Unrealized Gains	9	9
Gross Unrealized Losses		(1)
Estimated Fair Value	2,625	25,474
Commercial paper
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	9,991	28,137
Estimated Fair Value Total	9,991	28,137
Gross unrealized lesser than 12 months	(2)	(2)
Gross unrealized loss, Total	(2)	(2)
Commercial paper \| Level 2
Available for sale securities:
Amortized Cost	60,949	112,066
Gross Unrealized Gains	27	31
Gross Unrealized Losses	(2)	(2)
Estimated Fair Value	60,974	112,095
Money market funds \| Level 1
Available for sale securities:
Amortized Cost	30,637	35,736
Estimated Fair Value	$ 30,637	$ 35,736

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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