Investments (Tables)

9 Months Ended

Sep. 30, 2020

Investments All Other Investments [Abstract]

Summary of the Levels of the Fair Value Hierarchy into Which the Company's Financial Assets Fall

The following table summarizes the levels of the fair value hierarchy into which the Company’s financial assets fall as of September 30, 2020:

	Total		Level 1			Level 2			Level 3
Financial assets:
Included in cash and cash equivalents
U.S. treasury instruments	$	15,000	$	—		$		15,000	$	—
Government securities money market		24,487		—				24,487		—
Investments
U.S. treasury instruments		180,828			—			180,828		—
Common stock		1,117			1,117		—				—
Total financial assets	$	221,432	$		1,117	$		220,315	$		—

The following table summarizes the levels of the fair value hierarchy into which the Company’s financial assets fall as of December 31, 2019:

	Total		Level 1			Level 2			Level 3
Financial assets:
Included in cash and cash equivalents
U.S. treasury instruments	$	62,949	$		—	$		62,949	$	—
Government securities money market		33,065		—				33,065		—
Investments
U.S. treasury instruments		173,960		—				173,960		—
Common stock		327			327		—				—
Total financial assets	$	270,301	$		327	$		269,974	$		—