Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |
9 Months Ended | 12 Months Ended | |
---|---|---|---|
Sep. 30, 2018 |
Dec. 31, 2016 |
Jan. 01, 2018 |
|
Stock Option [Member] | |||
Common stock closing price | $ 1.01 | ||
Unrecognized compensation cost related to unvested options | $ 0.7 | ||
Weighted-average remaining period for recognition of compensation costs related to unvested options | 2 years 2 months 12 days | ||
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 | 474,946 |