Net Loss Per Share of Common Stock - Schedule of Net Loss Per Share Basic and Diluted (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net loss	$ 2,809,000	$ 897,000	$ (1,116,000)	$ (990,000)	$ (874,000)	$ (586,000)	$ (524,000)	$ (1,886,000)	$ (5,812,000)	$ (3,870,000)	$ (6,370,000)
Weighted-average common shares outstanding - basic and diluted									17,233,000	14,961,000	12,984,000
Basic and diluted net loss per share	$ (0.16)	$ (0.05)	$ (0.07)	$ (0.06)	$ (0.05)	$ (0.04)	$ (0.04)	$ (0.14)	$ (0.34)	$ (0.26)	$ (0.49)