Discontinued Operations - Assets and Liabilities of Discontinued Operations on Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Disposal Group Including Discontinued Operation Balance Sheet Disclosures [Abstract]
Receivables, net	$ 120
Total current assets	120
Deferred income tax assets, net	178	$ 178
Total assets of discontinued operations	298	178
Accounts payable and accrued expenses	8	51
Remaining lease obligations		485
Total current liabilities	8	536
Total liabilities of discontinued operations	$ 8	$ 536