Balance at
December 31, 2021

Additions

Deductions

Balance at
December 31, 2022

Accounts receivable and contract assets:

Billed receivables – Sanofi

$

—

$

6,650

$

(6,650

)

$

—

Unbilled receivables – Sanofi

135

9,052

(6,650

)

2,537

Total accounts receivable and contract assets

$

135

$

15,702

$

(13,300

)

$

2,537

Contract Liabilities:

Deferred Revenue – Vertex

$

19,212

$

—

$

(10,813

)

$

8,399

Deferred Revenue – Sanofi

81,822

9,052

(36,013

)

54,861

Total contract liabilities

$

101,034

$

9,052

$

(46,826

)

$

63,260