SONOVA Gamma Linolenic Acid ("GLA") Safflower Oil Inventory - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventory written down	$ 177,000	$ 0	$ 177,000	$ 0

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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