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Short-Term Investments - Summary of Short-Term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 222,820	$ 300,622
Available-for-sale securities, gross unrealized gains	147	5
Available-for-sale securities, gross unrealized losses		(92)
Available-for-sale securities	222,967	300,535
U.S. Treasury Bills and Government Agency Obligations
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	99,524	59,747
Available-for-sale securities, gross unrealized gains	91
Available-for-sale securities, gross unrealized losses		(6)
Available-for-sale securities	99,615	59,741
U.S. Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	33,007	59,164
Available-for-sale securities, gross unrealized gains	30
Available-for-sale securities, gross unrealized losses		(77)
Available-for-sale securities	33,037	59,087
Foreign Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	10,002	5,041
Available-for-sale securities, gross unrealized gains	16	5
Available-for-sale securities	10,018	5,046
U.S. Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	48,969	52,800
Available-for-sale securities, gross unrealized gains	10
Available-for-sale securities	48,979	52,800
Foreign Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	31,318	123,870
Available-for-sale securities, gross unrealized losses		(9)
Available-for-sale securities	$ 31,318	$ 123,861

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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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