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Nature of Business, Basis of Presentation and Liquidity - Liquidity (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
Liquidity
Accumulated deficit	$ 216,275		$ 216,275		$ 195,168
Net loss	7,057	$ 7,935	20,804	$ 24,904
Net cash used in operating activities			(19,969)	$ (21,008)
Cash and cash equivalents	$ 57,975		$ 57,975		$ 3,891
Minimum period to fund Operating expense			12 months

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Minimum period for Research and Development tax incentive to fund operating expense, 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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