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Facility Lease - Lease cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating lease cost
Operating lease costs	$ 239	$ 233	$ 478	$ 481
Costs of non-lease components (previously common area maintenance)	87	81	175	162
Total operating lease cost	326	314	653	643
Other Information
Operating cash flows used for operating lease	$ 377	$ 370	$ 755	$ 729
Remaining lease term	2 years 7 months 6 days	3 years 7 months 6 days	2 years 7 months 6 days	3 years 7 months 6 days
Discount rate	10.00%	10.00%	10.00%	10.00%

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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