|9 Months Ended|
Sep. 30, 2017
|Stock Plans [Abstract]|
|Stock Plans [Text Block]||
2. Stock Plans
The following table summarizes the stock-based compensation expense recorded for awards under the stock option plans for the three and nine-month periods ended September 30, 2017 and 2016:
No tax benefit was recognized related to stock-based compensation expense since we have accumulated operating losses and we have established a full valuation allowance to offset all the potential tax benefits associated with our deferred tax assets.
We use the Black-Scholes-Merton option-pricing model with the following assumptions to estimate the stock-based compensation expense for the three and nine-month periods ended September 30, 2017 and 2016:
Options to purchase approximately 50,000 shares of common stock were granted during the three-month period ended September 30, 2017. No options were granted during the three-month period ended September 30, 2016. Options to purchase approximately 546,000 and 168,000 shares of common stock were granted during the nine-month periods ended September 30, 2017 and 2016, respectively.
The following table summarizes option activity for the nine-month period ended September 30, 2017:
No shares of restricted stock were awarded to employees, directors and consultants during the three and nine-month periods ended September 30, 2017 and 2016.
As of September 30, 2017, there was approximately $0.8 million of total unrecognized compensation expense related to non-vested stock options. This expense is expected to be recognized over a weighted-average period of 1.2 years.
The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.
Reference 1: http://www.xbrl.org/2003/role/presentationRef