Stockholders' Equity (Deficit) (Tables)
|12 Months Ended|
Dec. 31, 2018
|Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]||
Information regarding warrants for common stock outstanding and exercisable as of December 31, 2018 is as follows:
Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef