Balance at

December

31, 2020

Additions

Deductions

Balance at June 30, 2021

Accounts receivable and contract assets:

Billed receivables from collaboration partners

$

7

$

5,026

$

(5,033

)

$

—

Unbilled receivables from collaboration partners

2,324

4,799

(4,946

)

2,177

Total accounts receivable and contract assets

$

2,331

$

9,825

$

(9,979

)

$

2,177

Contract liabilities:

Deferred revenue - Incyte

$

5,365

$

—

$

(2,648

)

$

2,717

Deferred revenue - GBT

16,721

78

(2,542

)

14,257

Total contract liabilities

$

22,086

$

78

$

(5,190

)

$

16,974