Stockholders' Equity - Weighted Average Assumptions Of Fair Value Options Using Black-Scholes Option-Pricing Model (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Equity [Abstract] | |||
| Dividend yield | 0.00% | 0.00% | 0.00% |
| Risk-free interest rate, minimum | 1.00% | 1.30% | 1.50% |
| Risk-free interest rate, maximum | 1.80% | 1.70% | 1.70% |
| Expected life (in years) | 5 years | 5 years | 5 years |
| Historical volatility, minimum | 46.80% | 47.40% | 49.60% |
| Historical volatility, maximum | 48.20% | 49.70% | 53.70% |