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Stock Based Compensation (Details) |  | 9 Months Ended |
--- | --- | --- | ---
Dec. 02, 2013 shares | Sep. 30, 2018 item shares | Sep. 30, 2017 shares | Dec. 31, 2017 shares
Stock-based compensation |  |  |  |
Common stock, shares issued |  | 56,212,449 |  | 47,002,488
Employee stock options |  |  |  |
Stock-based compensation |  |  |  |
Options granted (in shares) |  | 1,679,400 | 1,438,100 |
ESPP |  |  |  |
Stock-based compensation |  |  |  |
Total number of shares of common stock available for issuance |  | 581,286 |  |
Awards issued under the plan (in shares) |  | 318,945 |  |
Increase in shares of common stock available for issuance (in shares) |  | 0 |  |
ESPP | Maximum |  |  |  |
Stock-based compensation |  |  |  |
Annual percentage increase in shares of common stock available for issuance |  | 1.00% |  |
Annual increase in shares of common stock available for issuance (in shares) |  | 621,814 |  |
Restricted stock units |  |  |  |
Stock-based compensation |  |  |  |
Annual installment vesting periods | item |  | 3 |  |
The 2013 Plan |  |  |  |
Stock-based compensation |  |  |  |
Total number of shares of common stock available for issuance |  | 9,618,155 |  |
Annual percentage increase in shares of common stock available for issuance |  | 4.00% |  |
Awards issued under the plan (in shares) |  | 6,624,750 |  |
Increase in shares of common stock available for issuance (in shares) |  | 1,880,100 |  |
The 2010 Plan |  |  |  |
Stock-based compensation |  |  |  |
Total number of shares of common stock available for issuance |  | 2,684,456 |  |
Options granted (in shares) | 0 |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Number of additional shares authorized for issuance under an established share-based compensation plan. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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