Balance at

December

31, 2019

Additions

Deductions

Balance at

September 30, 2020

Accounts receivable and contract assets:

Billed receivables from collaboration partners

$

20,000

$

4,262

$

24,260

$

2

Unbilled receivables from collaboration partners

158

5,396

3,244

2,310

Total Accounts receivable and contract assets

$

20,158

$

9,658

$

27,504

$

2,312

Contract liabilities:

Deferred revenue - Incyte

$

8,378

$

335

$

1,200

$

7,513

Deferred revenue - GBT

$

20,000

$

681

$

2,799

$

17,882

Total contract liabilities

$

28,378

$

1,016

$

3,999

$

25,395