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Leases - Balance Sheet and Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Additional details of the leases
Right-of-use assets	$ 2,402		$ 2,402		$ 3,970
Current portion of lease liabilities	2,770		2,770		2,608
Operating lease liability, net of current portion					$ 2,076
Total operating lease liabilities	$ 2,770		$ 2,770
Weighted-average remaining life	1 year		1 year
Weighted-average discount rate	12.99%		12.99%
Facilities
Operating lease expense	$ 648	$ 648	$ 1,944	$ 1,944
Cash paid for operating lease	$ 767	$ 660	$ 2,288	$ 1,890

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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.

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

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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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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Amount of lessee's right to use underlying asset under operating lease.

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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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