Business Segment, Geographic and Quarterly Financial Data - Operations by Geographic Area (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Revenues	$ 73,664	$ 79,017	$ 109,338
Assets
Assets:	76,011	91,471
United States
Revenues:
Revenues	51,485	50,901	63,275
Assets
Assets:	47,437	64,324
Foreign
Revenues:
Revenues	22,179	28,116	$ 46,063
Assets
Assets:	$ 28,574	$ 27,147

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration