Stockholders' Equity (Tables)
|6 Months Ended|
Jun. 30, 2018
|Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]||
As a result, a summary of the Company’s outstanding and exercisable options as of June 30, 2018 was as follows (in thousands, except per share data):
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://www.xbrl.org/2003/role/presentationRef