Other Assets - Current (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid advertising	$ 101	$ 209
Prepaid expenses	461	678
Prepaid income taxes	269	457
Prepaid insurance	282	372
Due from related parties	87	86
Other prepaid taxes	480	474
Other current assets	$ 1,680	$ 2,276