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Stock-Based Compensation - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Feb. 20, 2018 | Jan. 01, 2018 | Jan. 01, 2017
2018 Equity Inducement Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Initial reserves of common stock |  |  |  |  | 1,100,000 |  |
2016 Equity Incentive Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of outstanding share of common stock |  |  | 4.00% |  |  |  |
Additional number of shares available for issuance |  |  |  |  |  | 666,807 | 537,233
Common stock available for future issuance | 84,521 |  | 84,521 |  |  |  |
2016 Equity Incentive Plan and 2018 Equity Inducement Plan | Stock Options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option to purchase an aggregate of common stock shares | 255,800 | 735,600 | 1,288,900 | 1,753,300 |  |  |
Stock options to purchase common stock aggregate fair value | $ 1,700,000 | $ 1,700,000 | $ 7,100,000 | $ 6,600,000 |  |  |
2016 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option to purchase an aggregate of common stock shares | 24,977 | 20,990 | 55,914 | 39,174 |  |  |
Aggregate cash proceeds from sale of shares | $ 129,000 | $ 53,000 | $ 207,000 | $ 131,000 |  |  |

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- Definition The maximum annual increase in the number of shares reserved under the plan as a proportion of outstanding common stock. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + 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 The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + 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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