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Stock-Based Compensation (Tables) - 2008 Equity Incentive Plan | 3 Months Ended
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Mar. 31, 2016
Activity Under Equity Incentive Plans Related to Stock Options | Activity under the Company’s equity incentive plans related to stock options is set forth below (in thousands except per share amounts):
|  | Number of Options Outstanding |  |  | Weighted Average Exercise Price per Share |
Balances at December 31, 2015 |  |  | 14,119 |  |  | $ | 4.21 |
Granted |  |  | 2,075 |  |  |  | 5.08 |
Forfeited |  |  | (37 | ) |  |  | 5.16 |
Expired |  |  | (89 | ) |  |  | 9.97 |
Exercised |  |  | (127 | ) |  |  | 2.33 |
Balances at March 31, 2016 |  |  | 15,941 |  |  |  | 4.31 |
Activity Under Equity Incentive Plans Related to RSUs | Activity under the Company’s equity incentive plans related to RSUs is set forth below (in thousands except per share amounts):
|  | Number of Shares Outstanding |  |  | Weighted Average Grant Date Fair Value per Share |
Balances at December 31, 2015 |  |  | — |  |  | $ | — |
Granted |  |  | 634 |  |  |  | 5.06 |
Forfeited |  |  | (1 | ) |  |  | 5.06 |
Vested |  |  | — |  |  |  | — |
Balances at March 31, 2016 |  |  | 633 |  |  |  | 5.06 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 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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