Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid SCY-078 development services	$ 422	$ 108
Prepaid insurance	450	285
Other prepaid expenses	153	91
Other receivable due from R-Pharm	816	430
Consideration in escrow	500	500
Other current assets	60	38
Total prepaid expenses and other current assets	$ 2,401	$ 1,452