Fair Value Measurements and Available for Sale Investments (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Measurements And Available For Sale Investments [Abstract]

Assets Measured at Fair Value on Recurring Basis

The following table presents the hierarchy for assets measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020 (in thousands):

	Fair Value Measurements at End of Period Using:
	Total Fair Value		Quoted Market Prices for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
As of March 31, 2021
Money market funds	$	352,900	$	352,900	$	—	$	—
Corporate debt securities	13,638		—		13,638		—
As of December 31, 2020
Money market funds	$	411,104	$	411,104	$	—	$	—
U.S. Treasury and agency securities	18,280		18,280		—		—
Corporate debt securities	26,573		—		26,573		—

Schedule of Available for Sale Investments by Security Type

The aggregate market value, cost basis, and gross unrealized gains and losses of available-for-sale investments by security type, classified in marketable securities and long-term investments as of March 31, 2021 are as follows (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Total Fair Value
Marketable securities
Corporate debt securities	$	13,530	$	108	$	—	$	13,638
Total marketable securities	$	13,530	$	108	$	—	$	13,638

Schedule of Contractual Maturities of Available-for-sale Debt Securities

Contractual maturities of available-for-sale debt securities, as of March 31, 2021, were as follows (in thousands):

	Estimated  Fair Value
Due within one year	$	13,638
One to two years	—
Total	$	13,638