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Marketable Securities and Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Available-for-sale Securities
Marketable securities, classified as available-for-sale, consisted of the following (in thousands):
December 31, 2020December 31, 2019
 Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Certificates of deposit$2,150 $— $— $2,150 $10,548 $10 $— $10,558 
Corporate securities45,070 83 (8)45,145 51,745 207 (1)51,951 
U.S. Treasury and agency securities9,493 12 — 9,505 9,222 3 — 9,225 
Commercial paper12,136 —— 12,136 500 — 500 
Asset-backed securities5,904 11 — 5,915 11,914 32 — 11,946 
Total$74,753 $106 $(8)$74,851 $83,929 $252 $(1)$84,180 
Schedule of Cost and Estimated Fair Values of Available-for-sale Securities by Contractual Maturity The following table summarizes the cost and estimated fair value of marketable securities based on stated effective maturities as of December 31, 2020 (in thousands):
 Amortized CostFair Value
Less than 1 year$58,717 $58,754 
Mature in 1 - 3 years16,036 16,097 
Total$74,753 $74,851 
Schedule of gross unrealized losses
Marketable securities in an unrealized loss position consisted of the following (in thousands):
Less Than 12 Months12 Months or MoreTotal
As of December 31, 2020Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Certificates of deposit$— $— $— $— $— $— 
Corporate securities20,355 (8)— — 20,355 (8)
U.S. Treasury and agency securities— — — — — — 
Commercial paper— — — — — — 
Asset-backed securities— — — — — — 
Total$20,355 $(8)$— $— $20,355 $(8)

Less Than 12 Months12 Months or MoreTotal
As of December 31, 2019Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Certificates of deposit$— $— $— $— $— $— 
Corporate securities2,996 (1)— — 2,996 (1)
U.S. Treasury and agency securities— — — — — — 
Commercial paper— — — — — — 
Asset-backed securities— — — — — — 
Total$2,996 $(1)$— $— $2,996 $(1)
Schedule of Cash, Cash Equivalents and Available-for-sale Investments Measured at Fair Value on Recurring Basis
The following is a summary of the Company’s cash, cash equivalents and marketable securities measured at fair value on a recurring basis (in thousands):
 December 31, 2020December 31, 2019
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Cash$62,388 $— $— $62,388 $35,546 $— $— $35,546 
Cash equivalents20,893 — — 20,893 10,196 — — 10,196 
Certificates of deposit— 2,150 — 2,150 — 10,558 — 10,558 
Corporate securities— 45,145 — 45,145 — 51,951 — 51,951 
U.S. Treasury and agency securities— 9,505 — 9,505 — 9,225 — 9,225 
Commercial paper— 12,136 — 12,136 — 500 — 500 
Asset-backed securities— 5,915 — 5,915 — 11,946 — 11,946 
Total$83,281 $74,851 $— $158,132 $45,742 $84,180 $— $129,922