Significant Customers and Concentrations of Risk - Revenues By Customer Location (Detail) - USD ($)	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Concentration Risk [Line Items]
Total revenues	$ 12,318,772	$ 8,348,037
United States of America [Member]
Concentration Risk [Line Items]
Total revenues	10,570,606	6,762,776
Europe [Member]
Concentration Risk [Line Items]
Total revenues	1,567,341	1,471,416
Other [Member]
Concentration Risk [Line Items]
Total revenues	$ 180,825	$ 113,845

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

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