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Short-Term Investments - Summary of Short-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 196,067	$ 300,622
Available-for-sale securities, gross unrealized gains	103	5
Available-for-sale securities, gross unrealized losses		(92)
Available-for-sale securities	196,170	300,535
U.S. Treasury Bills and Government Agency Obligations
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	69,702	59,747
Available-for-sale securities, gross unrealized gains	57
Available-for-sale securities, gross unrealized losses		(6)
Available-for-sale securities	69,759	59,741
U.S. Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	29,078	59,164
Available-for-sale securities, gross unrealized gains	23
Available-for-sale securities, gross unrealized losses		(77)
Available-for-sale securities	29,101	59,087
Foreign Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	10,670	5,041
Available-for-sale securities, gross unrealized gains	18	5
Available-for-sale securities	10,688	5,046
U.S. Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	32,363	52,800
Available-for-sale securities, gross unrealized gains	5
Available-for-sale securities	32,368	52,800
Foreign Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	54,254	123,870
Available-for-sale securities, gross unrealized losses		(9)
Available-for-sale securities	$ 54,254	$ 123,861

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