Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Related Party Transactions - Equity-Method Investment (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2018
Related Party Transaction [Line Items]
Share of losses for investee	$ (303)	$ 263	$ (15)
ADAIR Technology [Member] \| Vallon Pharmaceuticals, Inc. [Member]
Related Party Transaction [Line Items]
Equity method ownership percentage				30.00%
Share of losses for investee		$ 300
ADAIR Technology [Member] \| Vallon Pharmaceuticals, Inc. [Member] \| Minimum [Member]
Related Party Transaction [Line Items]
Equity method ownership percentage		19.00%