Stock-Based Compensation Arrangements (Stock-Based Compensation) (Detail) - USD ($)	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation	$ 355,941	$ 214,270
Stock option grants beginning of period [Member]
Share-based Compensation	309,872	210,340
Stock option grants [Member]
Share-based Compensation	44,976	3,367
Employee Stock Purchase Plan [Member]
Share-based Compensation	$ 1,093	$ 563

Costs and payments related to employee benefits and equity-based compensation, such as pension expense and contributions, other postretirement benefits expense and payments, stock or unit options expense, and amortization of restricted stock or unit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Name:	us-gaap_EmployeeBenefitsAndShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration