Net Loss per Common Share (Basic and Diluted Income (Loss) Per Share) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Basic and diluted net income (loss) per common share calculation:
Net income (loss)	$ (2,375,000)	$ 5,439,000	$ (9,338,000)	$ 1,715,000	$ (516,000)
Excess of fair value of consideration transferred on conversion of Series B Preferred stock	(1,214,000)		(3,580,000)
Accretion of Series B redeemable convertible preferred stock		(7,163,000)	(1,858,000)	(9,329,000)
Net (loss) income attributable to common stockholders	$ (3,589,000)	$ (1,724,000)	$ (14,776,000)	$ (7,614,000)
Weighted average number of shares of common stock outstanding - basic	11,120,394	5,813,063	8,590,772	5,247,508
Net loss per share of common stock - basic	$ (0.32)	$ (0.30)	$ (1.72)	$ (1.45)
Weighted average number of shares of common stock outstanding - diluted	11,120,394	5,813,063	8,648,914	5,247,508
Net loss per share of common stock - diluted	$ (0.32)	$ (0.30)	$ (1.77)	$ (1.45)
Net (loss) income attributable to common stockholders - Diluted	$ (3,589,000)	$ (1,724,000)	$ (15,325,000)	$ (7,614,000)
Increase (decrease) in diluted income (loss) per share	$ 0		549,000
June 2016 Offering Liability [Member]
Basic and diluted net income (loss) per common share calculation:
Changes in estimated fair value			$ (549,000)