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7. Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Assumptions for stock options |
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Expected life (years) |  |  | 4.04 |  |  |  | 4.21 |  |  |  | 4.22 |
Risk-free interest rate |  |  | 1.09% |  |  |  | 1.35% |  |  |  | 1.43% |
Volatility |  |  | 51% |  |  |  | 51% |  |  |  | 55% |
Expected dividend yield |  |  | – |  |  |  | – |  |  |  | – |
Option activity |
|  |  |  |  |  |  |  | Weighted
|  | Number of |  |  | Weighted |  |  | Average
|  | Shares |  |  | Average |  |  | Remaining
|  | (in thousands) |  |  | Exercise Price |  |  | Contractual Term
Options outstanding at the beginning of period |  |  | 11,228 |  |  | $ | 4.66 |  |  | N/A
Granted |  |  | 2,105 |  |  |  | 3.53 |  |  | N/A
Exercised |  |  | (448 | ) |  |  | 1.41 |  |  | N/A
Forfeited/Expired |  |  | (290 | ) |  |  | 5.93 |  |  | N/A
Options outstanding at the end of period |  |  | 12,595 |  |  | $ | 4.56 |  |  | 5.02 years
Options exercisable at the end of period |  |  | 7,396 |  |  | $ | 4.03 |  |  | 4.51 years

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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=6415400&loc=d3e5070-113901 + Details
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