Short-term Investments (Tables)

3 Months Ended

Mar. 31, 2021

Short Term Investments [Abstract]

Summary of Short-term Investments

The following is a summary of our short-term investments (in thousands):

	March 31, 2021
			Gross		Gross
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
U.S. treasury bills and government agency obligations	$	20,061	$	92	$	—	$	20,153
U.S. corporate debt securities		19,064		20		—		19,084
Foreign corporate debt securities		15,501		9		—		15,510
U.S. commercial paper		12,997		—		—		12,997
Foreign commercial paper		38,983		—		—		38,983
Total	$	106,606	$	121	$	—	$	106,727

	December 31, 2020
			Gross		Gross
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
U.S. treasury bills and government agency obligations	$	20,110	$	166	$	—	$	20,276
U.S. corporate debt securities		11,505		42		—		11,547
Foreign corporate debt securities		15,508		49		—		15,557
U.S. commercial paper		13,997		—		—		13,997
Foreign commercial paper		41,976		—		—		41,976
Total	$	103,096	$	257	$	—	$	103,353