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BeiGene Agreement (Tables)
 6 Months Ended
Jun. 30, 2019
Research and Development [Abstract]  
Schedule of Activity in Contract Liabilities
The following table presents a summary of the activity in the Company's contract liabilities during the six months ended June 30, 2019 (in thousands):

Opening balance, January 1, 2019
$
(481
)
Revenue from performance obligations satisfied during reporting period
156

Closing balance, June 30, 2019
$
(325
)