Revenue - Reconciliation of Deferred Revenue to Aggregate Revenue Under Contract (Detail) - USD ($)	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Deferred Revenue [Abstract]
Deferred revenue (GAAP basis)	$ 25,890,104	$ 26,558,707	$ 26,533,983
Amounts under non-cancellable contracts for which the Company does not yet have the contractual right to bill at the period end	21,604,000		25,470,000
Aggregate Revenue Under Contract	$ 47,494,000		$ 52,004,000

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

Name:	us-gaap_DeferredRevenueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant