Trade Receivables - Summary of Trade Receivables (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Receivable, Net, Current [Abstract]
Trade	$ 466	$ 432
Due from settlement attorneys	0	0
Related parties	11	145
Other	130	59
Trade receivables	$ 607	$ 636

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Name:	us-gaap_AccountsReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant