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Stock Incentive Plans - Stock-based Compensation (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2008 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock-based Compensation |  |  |  |
Stock-based compensation |  |  |  |
Share-based compensation expense (in dollars) |  | $ 6,378 | $ 5,602 | $ 3,548
Unrecognized compensation expense (in dollars) |  | $ 9,300 |  |
Period over which unrecognized compensation expense expected to be recognized |  | 2 years 6 months |  |
Stock-based Compensation | Cost of revenue |  |  |  |
Stock-based compensation |  |  |  |
Share-based compensation expense (in dollars) |  | $ 126 | 100 | 51
Stock-based Compensation | Research and development |  |  |  |
Stock-based compensation |  |  |  |
Share-based compensation expense (in dollars) |  | 1,322 | 1,178 | 790
Stock-based Compensation | Selling and marketing |  |  |  |
Stock-based compensation |  |  |  |
Share-based compensation expense (in dollars) |  | 1,594 | 1,326 | 707
Stock-based Compensation | General and administrative |  |  |  |
Stock-based compensation |  |  |  |
Share-based compensation expense (in dollars) |  | $ 3,336 | $ 2,998 | $ 2,000
Stock-based Compensation, employees |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |
Weighted-average volatility, low end of range (as a percent) |  | 52.49% | 52.56% | 70.19%
Weighted-average volatility, high end of range (as a percent) |  | 56.36% | 68.82% | 78.54%
Risk-free interest rate, low end of range (as a percent) |  | 1.16% | 1.55% | 1.66%
Risk-free interest rate, high end of range (as a percent) |  | 2.09% | 2.03% | 2.04%
Stock-based Compensation, non-employees |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |
Weighted-average volatility, low end of range (as a percent) |  | 52.77% | 64.72% | 73.20%
Weighted-average volatility, high end of range (as a percent) |  | 65.85% | 74.48% | 74.48%
Risk-free interest rate, low end of range (as a percent) |  | 1.39% | 1.78% | 2.09%
Risk-free interest rate, high end of range (as a percent) |  | 2.30% | 2.29% | 2.20%
ESPP |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |
Weighted-average volatility, low end of range (as a percent) |  | 46.38% | 53.57% |
Weighted-average volatility, high end of range (as a percent) |  | 75.72% | 58.10% |
Risk-free interest rate, low end of range (as a percent) |  | 0.40% | 0.17% |
Risk-free interest rate, high end of range (as a percent) |  | 0.50% | 0.33% |
Minimum | Stock-based Compensation, employees |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |
Weighted-average expected term |  | 5 years 6 months | 5 years 6 months | 5 years 6 months
Minimum | Stock-based Compensation, non-employees |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |
Weighted-average expected term |  | 7 years 9 months 18 days | 7 years 11 months 1 day | 8 years 9 months
Minimum | ESPP |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |
Weighted-average expected term |  | 6 months | 5 months 27 days |
Maximum | Stock-based Compensation, employees |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |
Weighted-average expected term |  | 6 years 3 months 7 days | 6 years 29 days | 6 years 29 days
Maximum | Stock-based Compensation, non-employees |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |
Weighted-average expected term |  | 8 years 6 months 22 days | 10 years | 10 years
Maximum | ESPP |  |  |  |
Assumptions used to calculate estimated fair value of stock options using the Black-Scholes option-pricing valuation model |  |  |  |
Weighted-average expected term |  | 1 year | 11 months 27 days |
2008 Plan | Maximum | Options |  |  |  |
Stock-based compensation |  |  |  |
Term of options granted | 10 years |  |  |
2008 Plan | Maximum | ISO |  |  |  |
Stock-based compensation |  |  |  |
Term of options granted to a person owning stock representing more than 10% of voting power of all classes of stock | 5 years |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&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 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 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=6415400&loc=d3e5070-113901 + 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=6415400&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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