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Equity Incentive Plans and Stock-Based Compensation (Details 2) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Number of Shares |  |  |
Outstanding, at the beginning of the period (in shares) |  | 7,008,833 |
Options granted (in shares) | 40,000 | 498,426 | 440,000
Options exercised (in shares) |  | (654,388) |
Options forfeited (in shares) |  | (1,472,366) |
Outstanding, at the end of the period (in shares) | 5,380,505 | 5,380,505 |
Vested or expected to vest at the end of the period (in shares) | 5,297,443 | 5,297,443 |
Options exercisable at the end of the period (in shares) | 3,874,169 | 3,874,169 |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the year (in dollars per shares) |  | $ 9.34 |
Options granted (in dollars per share) |  | 12.74 |
Options exercised (in dollars per share) |  | 7.04 |
Options forfeited (in dollars per share) |  | 10.95 |
Outstanding at the end of the period (in dollars per shares) | $ 9.49 | 9.49 |
Vested or expected to vest at the end of the period (in dollars per share) | 9.45 | 9.45 |
Options exercisable at the end of the period (in dollars per share) | $ 9.20 | $ 9.20 |
Weighted Average Remaining Contractual Term |  |  |
Outstanding |  | 5 years 5 months 23 days |
Vested or expected to vest |  | 5 years 5 months 5 days |
Options exercisable |  | 4 years 6 months 29 days |
Aggregate Intrinsic Value |  |  |
Outstanding | $ 16,061 | $ 16,061 |
Vested or expected to vest | 16,037 | 16,037 |
Options exercisable | $ 13,287 | $ 13,287 |
Stock Options with Market Condition [Member] |  |  |
Number of Shares |  |  |
Outstanding, at the beginning of the period (in shares) |  | 1,135,000 |
Outstanding, at the end of the period (in shares) | 320,000 | 320,000 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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