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Collaborations (Tables)
 6 Months Ended
Jun. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]  
Change in Accounts Receivable, Contract Asset and Liabilities

The following table presents the changes in accounts receivable, contract assets and liabilities for the six months ended June 30, 2021 (in thousands):

 

 

 

Balance at December 31, 2020

 

 

Additions

 

 

Deductions

 

 

Balance at June 30, 2021

 

Accounts receivable and contract assets:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Billed receivables - Sanofi

 

$

577

 

 

$

1,718

 

 

$

(2,295

)

 

$

—

 

Unbilled receivables - Sanofi

 

 

856

 

 

 

1,766

 

 

 

(1,718

)

 

 

904

 

Total accounts receivable and contract assets

 

$

1,433

 

 

$

3,484

 

 

$

(4,013

)

 

$

904

 

Contract liabilities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Deferred revenue - Vertex

 

$

37,748

 

 

$

—

 

 

$

(11,226

)

 

$

26,522

 

Deferred revenue - Sanofi

 

 

132,642

 

 

 

1,766

 

 

 

(25,995

)

 

 

108,413

 

Total contract liabilities

 

$

170,390

 

 

$

1,766

 

 

$

(37,221

)

 

$

134,935