Carrying amount as of the balance sheet date of obligations due all related parties.

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Related Party Transactions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Number of shares granted, option to purchase			608,185	681,950	1,009,125
Option exercise price per share			$ 2.77		$ 2.02
Director
Related Party Transaction [Line Items]
Scientific consulting and other expenses	$ 34	$ 34	$ 68	$ 68
Number of shares granted, option to purchase				66,907
Option exercise price per share				$ 2.02
Due to related party	$ 11		$ 11