Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid Insurance	$ 202	$ 243
Prepaid Clinical Trials	322	419
Prepaid Other	221	27
Deferred Operating Costs	32	28
Total prepaid expenses and other current assets	$ 777	$ 717