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Stock-Based Compensation - Schedule of Fair Value of Employee Stock Options (Details) | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Options to Purchase Common Stock |  |
Share-based Compensation |  |
Expected volatility, Minimum | 51.90% | 47.20%
Expected volatility, Maximum | 53.10% | 59.30%
Risk-free interest rate, Minimum | 2.60% | 2.00%
Risk-free interest rate, Maximum | 2.90% | 2.10%
Minimum | Options to Purchase Common Stock |  |
Share-based Compensation |  |
Expected term (in years) | 5 years 8 months 12 days | 5 years 9 months 18 days
Maximum | Options to Purchase Common Stock |  |
Share-based Compensation |  |
Expected term (in years) | 6 years 1 month 6 days | 6 years 1 month 6 days
2016 Employee Stock Purchase Plan |  |
Share-based Compensation |  |
Expected volatility, Minimum | 59.50% |
Expected volatility, Maximum | 87.80% |
Expected volatility |  | 49.50%
Risk-free interest rate, Minimum | 0.90% |
Risk-free interest rate, Maximum | 2.10% |
Risk-free interest rate |  | 0.50%
Expected term (in years) |  | 6 months
2016 Employee Stock Purchase Plan | Minimum |  |
Share-based Compensation |  |
Expected term (in years) | 6 months |
2016 Employee Stock Purchase Plan | Maximum |  |
Share-based Compensation |  |
Expected term (in years) | 1 year |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + 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 Expected term of share-based compensation awards, 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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