Stock-Based Compensation (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016	Sep. 19, 2017	Sep. 07, 2017	Jun. 30, 2017	Jan. 01, 2017
Intrinsic value of options exercisable	$ 9,000	$ 9,000
Common stock closing price			$ 4.40	$ 0.99		$ 0.78
Unrecognized share based compensation expense for nonvested options	$ 1,500,000	$ 1,500,000
Weighted average recognition period for unrecognized compensatione expense related to unvested stock options		2 years 8 months 12 days
November 2016 Warrants [Member]
Common stock closing price	$ 0.91	$ 0.91	$ 4.40
Employee Stock Purchase Plan 2016 [Member]
Additional shares added to the Plan during period		16,488
ESPP plan description		The shares are sold to participants at a price equal to the lesser of 85% of the fair market value of the Company's common stock at the (i) beginning of the offering period, or (ii) end of the six-month purchase period
Percent of fair market value at which employees can purchase common stock		85.00%
Shares provided for under ESPP			12,000
Shares issued under ESPP	4,200	4,200
Compensation costs related to ESPP	$ 1,000	$ 5,000
Equity Incentive Plan 2016 [Member]
Expiration period of share-based payment award		10 years
Vesting period of share-based compensation award		4 years
Additional shares added to the Plan during period			100,000
Increase in shares reserved for future issuance					800,000		82,440