Stock-Based Compensation (Narrative) (Details) - USD ($)		12 Months Ended
	Jan. 01, 2017	Dec. 31, 2017	Dec. 31, 2016	Sep. 19, 2017	Sep. 07, 2017
Intrinsic value of options exercisable		$ 14,000
Common stock closing price		$ 1.01	$ 4.40	$ 0.99
Unrecognized compensation cost related to unvested options		$ 1,100,000
Weighted-average remaining period for recognition of compensation costs related to unvested options		2 years 7 months 6 days	2 years 7 months 2 days
November 2016 Warrant Derivative Liability [Member]
Common stock closing price		$ 1.01	$ 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 during the period		4,200	3,272
ESPP compensation expenses		$ 5,000	$ 12,000
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				800,000