Revenues (Tables)

12 Months Ended

Dec. 31, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Revenue recognized was earned under the Company’s R&D Agreements and is summarized below based on the nature of payment type for the years ended December 31, (in thousands):

Timing of Transfer of Goods or Services	2022		2021
Over time:
License fees (1)	$	3,442	$	3,533
R&D services		2,140		2,072
Reimbursements		820		1,850
Point in time:
Milestones		1,000		—
Total revenues	$	7,402	$	7,455

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(1)2021 license fees include a cumulative catch-up adjustment reducing revenue by approximately $1.4 million with an equal increase in total contract liabilities as of December 31, 2021, for changes in total estimated effort to be incurred in the future to satisfy the performance obligation.

Contract with Customer, Contract Asset, Contract Liability, and Receivable

Contract balances are as follows as of December 31, (in thousands):

	2022		2021
Receivables, included in accounts receivable, net	$	376	$	1,239
Contract assets, included in prepaid expenses and other current assets	$	—	$	149
Contract liabilities, included in deferred revenue, current and    deferred revenue net of current portion	$	1,749	$	5,648

Disclosure of Change in Revenue From Contract With Customers

A reconciliation of the beginning and ending amount of contract liabilities, which are primarily related to the combined performance obligation for the transfer of Company’s license and R&D services and conducting R&D activities, which are a separate performance obligation in the Company’s contracts pursuant to research plans under the agreements, was as follows for the years ended December 31, (in thousands):

	2022			2021
Beginning balance	$	5,648		$	9,731
Recognized as revenue:
License fees		(3,442	)		(3,548	)
Reimbursements		(457	)		(535	)
Ending balance	$	1,749		$	5,648