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Marketable Securities

9 Months Ended

Sep. 30, 2021

Investments [Abstract]

Marketable Securities

Marketable Securities

The amortized cost, unrealized gain (loss), and estimated fair value of the Company's investments in securities available for sale consisted of the following:

			September 30, 2021
			Amortized Cost						Unrealized Gain						Unrealized Loss						Estimated Fair Value
Marketable securities
U.S. government securities			$	374,849					$	1					$	(257)					$	374,593
Commercial paper			16,880						—						—						16,880
Asset-backed securities			2,017						—						—						2,017
Corporate debt securities			15,468						3						(7)						15,464
Total marketable securities			$	409,214					$	4					$	(264)					$	408,954

			December 31, 2020
			Amortized Cost						Unrealized Gain						Unrealized Loss						Estimated Fair Value
Marketable securities
U.S. government securities			$	125,823					$	47					$	(6)					$	125,864
Commercial paper			4,991						—						—						4,991
Asset-backed securities			4,294						21						—						4,315
Corporate debt securities			14,683						52						(2)						14,733
Total marketable securities			$	149,791					$	120					$	(8)					$	149,903

The Company had sixteen and six separate marketable securities in unrealized loss positions as of September 30, 2021 and December 31, 2020, respectively. The Company did not identify any marketable securities that were other-than-temporarily impaired as of September 30, 2021 and December 31, 2020.

The following table summarizes the stated maturities of the Company’s marketable securities:

			September 30, 2021												December 31, 2020
			Amortized Cost						Estimated Fair Value						Amortized Cost						Estimated Fair Value
Due within one year			$	56,756					$	56,756					$	149,791					$	149,903
Due after one year through two years			352,458						352,198						—						—
Total			$	409,214					$	408,954					$	149,791					$	149,903

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- References

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- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-URI http://asc.fasb.org/subtopic&trid=2209399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-URI http://asc.fasb.org/subtopic&trid=2324412

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-URI http://asc.fasb.org/topic&trid=2196928

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-URI http://asc.fasb.org/subtopic&trid=2176304

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1403
-Paragraph (b)

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