Stock-Based Compensation (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Jan. 01, 2017
Intrinsic value of options exercisable	$ 0
Common stock closing price	$ 4.30
Unrecognized share based compensation expense for nonvested options	$ 1,600,000
Weighted average recognition period for unrecognized compensatione expense related to unvested stock options	2 years 6 months
Remaining shares authorized for issuance	67,000,000	67,000,000
Common Stock Issuance Agreement [Member]
Common stock closing price	$ 4.30	$ 4.40
Remaining shares authorized for issuance	28,684	28,684
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	0
Compensation costs related to ESPP	$ 3,000
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