Other Current Assets- Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Assets Current	$ 511	$ 902
Prepaid Insurance	100
Acute Myeloid Leukemia
Other Assets Current	200
Prepaid Expenses
Other Assets Current	500	$ 900
Other Prepaid Expenses
Other Assets Current	$ 200