Short-term and Long-term Investments (Tables)

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Short-term and Long-term Investments

The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of March 31, 2021:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Aggregate Fair Value
U.S. government debt securities	$	181,711	$	1	$	(36)	$	181,676
Certificates of deposit	265		—		—		265
Total	$	181,976	$	1	$	(36)	$	181,941

The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of December 31, 2020:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Aggregate Fair Value
U.S. government debt securities	$	48,048	$	14	$	(1)	$	48,061
Certificates of deposit	264		—		—		264
Total	$	48,312	$	14	$	(1)	$	48,325

Contractual Obligation, Fiscal Year Maturity

The estimated fair value of available-for-sale investments classified by their contractual maturities as of March 31, 2021 was:

Due within one year	$	78,331
After one year through three years	103,610
Total	$	181,941