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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of weighted average assumptions | The weighted average assumptions used in the Black-Scholes model for employees and directors are presented below:
| Three Months Ended June 30, | Six Months Ended June 30,
| 2017 |  | 2016 | 2017 |  | 2016
Risk-free interest rate | 1.97% |  | 0.95% | 2.22% |  | 0.91%
Expected volatility | 73% |  | 76% | 73% |  | 76%
Expected life in years | 6.0 |  | 5.0 | 6.0 |  | 5.0
Dividend yield | — |  | — | — |  | —
Forfeiture rate | — |  | 7% | — |  | 7%

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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