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Fair value measurements
6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Fair value measurements Fair value measurements
The Company measures certain financial instruments and other items at fair value.

To determine the fair value, the Company uses the fair value hierarchy for inputs used in measuring fair value that maximize the use of observable inputs and minimize the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use to value an asset or liability and are developed based on market data obtained from independent sources. Unobservable inputs are inputs based on assumptions about the factors market participants would use to value an asset or liability. The three levels of inputs that may be used to measure fair value are as follows: 
Level 1 inputs are quoted market prices for identical instruments available in active markets.
Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability either directly or indirectly. If the asset or liability has a contractual term, the input must be observable for substantially the full term. An example includes quoted market prices for similar assets or liabilities in active markets.
Level 3 inputs are unobservable inputs for the asset or liability and will reflect management’s assumptions about market assumptions that would be used to price the asset or liability.

Assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurements. Changes in the observability of valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy.

The carrying values of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the immediate or short-term maturity of these financial instruments.

To determine the fair value of the contingent consideration (Note 8), the Company uses a probability weighted assessment of the likelihood the milestones would be met and the estimated timing of such payments, and then the potential contingent payments are discounted to their present value using a probability adjusted discount rate that reflects the early stage nature of the development program, the time to complete the program development, and overall biotech indices. The Company determined the fair value of the contingent consideration was $7.2 million as of June 30, 2023 and the decrease of $0.4 million from December 31, 2022 has been recorded as a component of total operating expenses in the statements of operations and comprehensive loss for the six months ended June 30, 2023. The assumptions used in the discounted cash flow model are level 3 inputs as defined above. The Company assessed the sensitivity of the fair value measurement to changes in these unobservable inputs, and determined that changes within a reasonable range would not result in a materially different assessment of fair value.  
The following tables present information about the Company’s assets and liabilities that are measured at fair value on a recurring basis, and indicates the fair value hierarchy of the valuation techniques used to determine such fair value:

Level 1Level 2Level 3Total
As of June 30, 2023(in thousands)
Assets
Cash and cash equivalents$27,197 $— $— $27,197 
Investments in marketable securities, current— 125,287 — 125,287 
Investments in marketable securities, non-current— 11,057 — 11,057 
Total$27,197 $136,344 $— $163,541 
Liabilities
Contingent consideration— — 7,168 7,168 
Total$— $— $7,168 $7,168 


Level 1Level 2Level 3Total
As of December 31, 2022(in thousands)
Assets
Cash and cash equivalents$30,776 $— $— $30,776 
Investments in marketable securities, current— 116,137 — 116,137 
Investments in marketable securities, non-current— 37,363— 37,363 
Total$30,776 $153,500 $— $184,276 
Liabilities
Contingent consideration— — 7,531 7,531 
Total$— $— $7,531 $7,531 


The following table presents the changes in fair value of the Company’s contingent consideration:
 Liability at beginning of the periodChange in fair value of liabilityLiability at end of the period
(in thousands)
Six Months Ended June 30, 2023$7,531 $(363)$7,168 
Six Months Ended June 30, 2022$5,298 $409 $5,707