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Stock-Based Compensation - Summary of Shares of Common Stock Available for Issuance (Details) - shares | Jun. 30, 2020 | Dec. 31, 2019
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Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total number of shares reserved |  | 9,661,582 | 7,416,094
2011 Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Reserved for issuance upon exercise of options outstanding |  | 3,902,797 | 4,474,057
2019 Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Reserved for issuance upon exercise or settlement of awards outstanding |  | 2,231,539 | 377,378
Issuance under 2019 Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares of stock options reserved for issuance | [1] | 2,113,980 | 2,392,343
Inducement Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares of stock options reserved for issuance |  | 880,100 |
Reserved for issuance upon exercise or settlement of awards outstanding |  | 119,900 |
ESPP |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares of stock options reserved for issuance | [2] | 413,266 | 172,316
[1] | June 30, 2020 balance includes share increase added January 1, 2020 pursuant to the “evergreen” provision in the amount of 1,562,151 shares
[2] | June 30, 2020 balance includes share increase added January 1, 2020 pursuant to the “evergreen” provision in the amount of 312,430 shares

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- Definition Share Based Compensation arrangement by share based payment award equity instruments options and other than options grants in period but not vested. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period but not vested. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award, options and equity instruments other than options, grants in period, unvested and unexercised but reserved shares yet granted. + 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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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