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Stockholders' Equity - Equity Incentive Plans (Details) - shares | 12 Months Ended |
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Dec. 31, 2017 | Jan. 01, 2018
2004 Equity Incentive Plan | Employee Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Award vesting period | 4 years |
Award expiration period | 10 years |
Expiration period, after termination of employment or relationship of consultant or director | 90 days |
2004 Equity Incentive Plan | Employee Stock Options | Tranche One |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Award vesting period | 12 months |
Award vesting, percentage of award | 25.00% |
2004 Equity Incentive Plan | Employee Stock Options | Tranche Two |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Award vesting period | 36 months |
Award vesting, percentage of award | 75.00% |
2014 Equity Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Number of shares authorized for issuance | 5,300,000 |
Automatic annual increase in common stock reserved for issuance, percentage | 5.00% |
2014 Equity Incentive Plan | Subsequent Event |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Shares of common stock reserved for future issuance, additional shares |  | 2,831,582
2014 Equity Incentive Plan | Employee Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Award expiration period | 10 years |
2014 Equity Incentive Plan | Restricted Stock Units | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Award vesting period | 1 year |
2014 Equity Incentive Plan | Restricted Stock Units | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Award vesting period | 4 years |

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- Definition Common Stock, Capital Shares Reserved for Future Issuance, Annual Increase, Percentage + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period of Vested Award + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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