Annual report pursuant to Section 13 and 15(d)

Prepaid Expenses and Other Current Assets (Detail)

v3.19.1
Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Prepaid research and development services $ 245 $ 384
Prepaid insurance 200 279
Other prepaid expenses 20 62
Other receivable due from R-Pharm 0 251
NOL sale receivable 6,732 0
Other current assets 54 91
Total prepaid expenses and other current assets $ 7,251 $ 1,067