Investments and Fair Value Measurements - Available-for-sale securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available for sale securities:
Amortized Cost	$ 211,427	$ 274,014
Gross Unrealized Gains	53	148
Gross Unrealized Losses	(6)	(3)
Estimated Fair Value	211,474	274,159
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	44,420	33,644
Estimated Fair Value Total	44,420	33,644
Gross unrealized lesser than 12 months	(6)	(3)
Gross unrealized loss, Total	(6)	(3)
Marketable securities
Available for sale securities:
Amortized Cost	211,427	238,278
Gross Unrealized Gains	53	148
Gross Unrealized Losses	(6)	(3)
Estimated Fair Value	211,474	238,423
US government securities \| Level 1
Available for sale securities:
Amortized Cost	75,036	100,746
Gross Unrealized Gains	34	108
Estimated Fair Value	75,070	100,854
US government agency securities \| Level 2
Available for sale securities:
Amortized Cost	74,971
Gross Unrealized Gains	18
Estimated Fair Value	74,989
Corporate notes
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	5,045	5,507
Estimated Fair Value Total	5,045	5,507
Gross unrealized lesser than 12 months	(1)	(1)
Gross unrealized loss, Total	(1)	(1)
Corporate notes \| Level 2
Available for sale securities:
Amortized Cost	5,046	25,466
Gross Unrealized Gains		9
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	5,045	25,474
Commercial paper
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	39,375	28,137
Estimated Fair Value Total	39,375	28,137
Gross unrealized lesser than 12 months	(5)	(2)
Gross unrealized loss, Total	(5)	(2)
Commercial paper \| Level 2
Available for sale securities:
Amortized Cost	56,374	112,066
Gross Unrealized Gains	1	31
Gross Unrealized Losses	(5)	(2)
Estimated Fair Value	$ 56,370	112,095
Money market funds \| Level 1
Available for sale securities:
Amortized Cost		35,736
Estimated Fair Value		$ 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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