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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of the Company’s Assets and Liabilities that are Measured and Recognized at Fair Value on a Recurring Basis Classified Under the Appropriate Level of the Fair Value Hierarchy
The following table presents the Company’s assets and liabilities that are measured and recognized at fair value on a recurring basis classified under the appropriate level of the fair value hierarchy as of September 30, 2021 and December 31, 2020:
 
Fair Value Measurements at
September 30, 2021
(in thousands)Quoted Prices in Active Markets for Identical Assets and Liabilities
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)		Total
Assets:
Money market fund$12,650 $— $— $12,650 
Total included in cash and cash equivalents (1)$12,650 $— $— $12,650 
Available for sale investments:
Certificate of deposit— 2,610 — 2,610 
Corporate debt securities— 77,910 — 77,910 
    Commercial paper— 12,436 — 12,436 
Non U.S. government— 732 — 732 
U.S. treasury securities27,194 — — 27,194 
Total available for sale investments (2)$27,194 $93,688 $— $120,882 
Total assets measured at fair value on a recurring basis$39,844 $93,688 $— $133,532 
Liabilities:
Derivative financial instruments—warrants (3)
$— $— $5 $5 
Total liabilities measured at fair value on a recurring basis$— $— $5 $5 


Fair Value Measurements at
December 31, 2020
(in thousands)Quoted Prices in Active Markets for Identical Assets and Liabilities
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)		Total
Assets:
Money market fund (1)$129,988 $— $— $129,988 
Total assets measured at fair value on a recurring basis$129,988 $— $— $129,988 
Liabilities:
Derivative financial instruments—warrants (3)
$— $— $285 $285 
Total liabilities measured at fair value on a recurring basis$— $— $285 $285 
(1) Included as a component of cash and cash equivalents on the accompanying condensed balance sheets. Cash equivalents are considered by the Company to be highly liquid investments purchased with original maturities of three months or less from the date of purchase.

(2) Included in short-term investments in the accompanying condensed balance sheets.

(3) A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. At each reporting period, all assets and liabilities for which the fair value
measurement is based on significant unobservable inputs or instruments that trade infrequently and therefore have little or no price transparency are classified as Level 3. See Note 6 to the condensed financial statements for further information.