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Financial Instruments and Fair Value Measurements - Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-Sale Securities
Amortized Cost	$ 248,932	$ 204,808
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	248,932	204,808
Credit loss	0
Money market funds
Available-for-Sale Securities
Amortized Cost	248,932	204,808
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 248,932	$ 204,808

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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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