Stock-Based Compensation Arrangements (Stock-Based Compensation) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stock-based compensation expense	$ 252,925	$ 122,578	$ 399,235	$ 244,799
Stock option grants beginning of period [Member]
Stock-based compensation expense	141,383	120,650	239,823	240,182
Stock option grants [Member]
Stock-based compensation expense	110,323	127	157,371	1,167
Employee Stock Purchase Plan [Member]
Stock-based compensation expense	$ 1,219	$ 1,801	$ 2,041	$ 3,450