SONOVA Gamma Linolenic Acid ("GLA") Safflower Oil Inventory - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 45	$ 44
Finished goods	1,370	1,535
Inventories	$ 1,415	$ 1,579