Stock-Based Compensation (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Jan. 01, 2017
Intrinsic value of options exercisable	$ 0	$ 0
Common stock closing price	$ 0.78	$ 0.78	$ 4.40
Unrecognized share based compensation expense for nonvested options	$ 900,000	$ 900,000
Weighted average recognition period for unrecognized compensatione expense related to unvested stock options		2 years 6 months
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	$ 4,000
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				82,440