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OPERATING LEASES - UNDISCOUNTED FUTURE NON-CANCELLABLE LEASE PAYMENTS (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Operating Lease Liabilities, Payments Due
2020	$ 713
2021	913
2022	938
2023	962
2024	987
Thereafter	3,762
Total lease payments	8,275
Less: undiscounted lease payments related to Foster City Lease	(4,427)
Less: imputed interest	(1,294)
Operating lease liability	$ 2,554

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Amount of lessee's undiscounted obligations for lease payments for operating lease not yet commenced.

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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