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Short-term Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Short-term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 45,265	$ 119,749
Gross Unrealized Gains	20	0
Gross Unrealized Losses	0	(61)
Aggregate Fair Value	45,285	119,688
U.S. government debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	44,925	119,401
Gross Unrealized Gains	20	0
Gross Unrealized Losses	0	(61)
Aggregate Fair Value	44,945	119,340
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	340	348
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Aggregate Fair Value	$ 340	$ 348

X

- Definition

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).

+ References

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+ References

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