Quarterly report pursuant to Section 13 or 15(d)

Prepaid Expenses and Other Current Assets (Detail)

v3.19.3
Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Prepaid research and development services $ 303 $ 245
Prepaid insurance 412 200
Other prepaid expenses 88 20
NOL sale receivable 0 6,732
Other current assets 51 54
Total prepaid expenses and other current assets $ 854 $ 7,251