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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2023
Income Tax Disclosure [Abstract]  
Schedule of Loss before Income Tax Provision
The components of loss before income tax provision consist of the following:
Year Ended December 31,
(in thousands)202320222021
U.S.$(163,580)$(128,650)$(57,741)
Foreign(43)(50)(55)
Consolidated net loss before income taxes$(163,623)$(128,700)$(57,796)
Schedule of Components of Deferred Tax Assets and Liabilities
Significant components of our deferred tax assets and liabilities are as follows:
December 31,
(in thousands)20232022
Deferred Tax Assets:
Net operating loss carryforwards$72,777 $66,160 
Section 174 Capitalized R&D37,240 16,570 
Research and development credits19,058 12,844 
Equity compensation10,533 10,021 
Deferred Zejula royalty revenue6,978 7,371 
Lease liability3,912 4,194 
Other, net7,201 3,458 
Total deferred tax assets157,699 120,618 
Deferred Tax Liabilities:
ROU asset(3,552)(3,859)
Other, net(2,658)— 
Fixed assets(122)(189)
Total deferred tax liabilities(6,332)(4,048)
Net deferred tax assets151,367 116,570 
Less: valuation allowance(151,367)(116,570)
Deferred tax assets, net of valuation allowance$— $— 
Schedule of Reconciliation of Expected Statutory Federal Income Tax Provision and Actual Income Tax Provision
The following is a reconciliation of the expected statutory federal income tax provision to our actual income tax provision:
Year Ended December 31,
(in thousands)202320222021
Expected income tax benefit at federal statutory tax rate$(34,361)$(27,026)$(12,138)
State income taxes, net of federal benefit(1,912)(800)(142)
Permanent items56 27 17 
Equity compensation2,840 (297)(708)
Non-deductible compensation3,693 2,060 — 
Research credits(6,213)(3,319)8,087 
Other109 (6)42 
Change in the valuation allowance35,784 29,385 4,842 
Income tax (benefit) expense$(4)$24 $— 
Schedule of Activity Related to Unrecognized Tax Benefits The following table summarizes the activity related to our unrecognized tax benefits:
Year Ended December 31,
(in thousands)20232022
Balance at the beginning of the year$3,369 $2,473 
Increase related to prior year tax positions
153 — 
Increase related to current year tax positions1,494 896 
Balance at the end of the year$5,016 $3,369