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BEIGENE AGREEMENT (Tables)
 12 Months Ended
Dec. 31, 2018
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 year ended December 31, 2018 (in thousands):

Opening balance, January 1, 2018
$
—

Revenue from performance obligations satisfied during reporting period
52

Payments received in advance
(533
)
Closing Balance, December 31, 2018
$
(481
)