Investments and Fair Value Measurements - Available-for-sale securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available for sale securities:
Amortized Cost	$ 432,589	$ 274,014
Gross Unrealized Gains	555	148
Gross Unrealized Losses	(41)	(3)
Estimated Fair Value	433,103	274,159
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months		33,644
Estimated Fair Value Total		33,644
Gross unrealized lesser than 12 months		(3)
Gross unrealized loss, Total		(3)
Estimated Fair Value
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	47,221
Estimated Fair Value Total	47,221
Gross unrealized lesser than 12 months	(41)
Gross unrealized loss, Total	(41)
Marketable securities
Available for sale securities:
Amortized Cost	232,010	238,278
Gross Unrealized Gains	555	148
Gross Unrealized Losses	(41)	(3)
Estimated Fair Value	232,524	238,423
US government securities \| Level 1
Available for sale securities:
Amortized Cost	79,855	100,746
Gross Unrealized Gains	490	108
Estimated Fair Value	80,345	100,854
US government agency securities \| Level 2
Available for sale securities:
Amortized Cost	34,935
Gross Unrealized Gains	17
Estimated Fair Value	34,952
Corporate notes
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	2,615	5,507
Estimated Fair Value Total	2,615	5,507
Gross unrealized lesser than 12 months	(2)	(1)
Gross unrealized loss, Total	(2)	(1)
Corporate notes \| Level 2
Available for sale securities:
Amortized Cost	2,617	25,466
Gross Unrealized Gains		9
Gross Unrealized Losses	(2)	(1)
Estimated Fair Value	2,615	25,474
Commercial paper
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	44,606	28,137
Estimated Fair Value Total	44,606	28,137
Gross unrealized lesser than 12 months	(39)	(2)
Gross unrealized loss, Total	(39)	(2)
Commercial paper \| Level 2
Available for sale securities:
Amortized Cost	114,603	112,066
Gross Unrealized Gains	48	31
Gross Unrealized Losses	(39)	(2)
Estimated Fair Value	114,612	112,095
Money market funds \| Level 1
Available for sale securities:
Amortized Cost	200,579	35,736
Estimated Fair Value	$ 200,579	$ 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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