Accounting for Stock-Based Compensation - Key Assumptions (Details) |
6 Months Ended | |
---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
|
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||
Risk-free interest rate, minimum | 2.00% | 1.40% |
Risk-free interest rate, maximum | 2.10% | 1.80% |
Volatility, minimum | 63.00% | 69.00% |
Volatility, maximum | 64.00% | 70.00% |
Dividends | 0.00% | 0.00% |
Employees | ||
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||
Expected life | 5 years 6 months | 6 years |
Officer | ||
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||
Expected life | 5 years 6 months | 7 years |
Directors | ||
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||
Expected life | 6 years 3 months | 7 years |