Equity Incentive Plans - Schedule of Stock Option Plan (Details)	6 Months Ended
Jun. 30, 2017 $ / shares shares
Number of options
Number of options, Outstanding at beginning of year \| shares	11,377,354
Number of options, Granted \| shares	4,757,238
Number of options, Exercised \| shares	(639,902)
Number of options, Forfeited and cancelled \| shares	(205,370)
Number of options, Outstanding at ending of year \| shares	15,289,320
Number of options, Exercisable options \| shares	6,722,358
Number of options, Vested and expected to vest \| shares	15,289,320
Weighted average exercise price
Weighted average exercise price, Outstanding at beginning of year \| $ / shares	$ 9.76
Weighted average exercise price, Granted \| $ / shares	9.25
Weighted average exercise price, Exercised \| $ / shares	2.13
Weighted average exercise price, Forfeited and cancelled \| $ / shares	12.65
Weighted average exercise price, Outstanding at end of year \| $ / shares	9.88
Weighted average exercise price, Exercisable options \| $ / shares	7.49
Weighted average exercise price, Vested and expected to vest \| $ / shares	$ 9.88

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.

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-Name Accounting Standards Codification
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-Section 50
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-Subparagraph (c)(1)(iii)
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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