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Stockholders' Equity - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | Jan. 01, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Net proceeds from sale of common stock | $ 64,500,000 |  |  |  |  |  |
Underwriting discounts and commissions | 4,100,000 |  |  |  |  |  |
Offering costs | $ 400,000 |  |  |  |  |  |
Reduction in exercise price of each warrant from public offering price for pre-funded warrants per share | $ 0.0001 |  |  |  |  |  |
Maximum ownership percentage for outstanding warrants to purchase shares of common stock to be exercised | 4.99% |  |  |  |  |  |
Period after notice received by company maximum ownership percentage to be effective description |  |  |  | The revised Maximum Ownership Percentage would be effective 60 days after the notice is received by the Company. |  |  |
Proceeds from Warrant Exercises |  |  |  | $ 0 |  |  |
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 |  |  |  |  |  | 965,603 | 666,807
Common stock available for future issuance |  | 1,459,072 |  | 1,459,072 |  |  |
2016 Equity Incentive Plan | Stock Options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option to purchase an aggregate of common stock shares |  | 159,600 | 203,600 | 1,201,900 | 1,033,100 |  |
Stock options to purchase common stock aggregate fair value |  | $ 700,000 | $ 1,500,000 | $ 6,900,000 | $ 5,400,000 |  |
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 |  | 0 | 0 | 20,132 | 30,937 |  |
Aggregate cash proceeds from sale of shares |  |  |  | $ 100,000 | $ 100,000 |  |
Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares issued |  |  | 5,047,000 |  |  |  |
Follow-on Public Offering | Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares issued | 4,625,000 |  |  |  |  |  |
Public offering price | $ 8.00 |  |  |  |  |  |
Public offering price of warrant | $ 7.9999 |  |  |  |  |  |
Follow-on Public Offering | Common Stock | Maximum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Warrants to purchase shares | 4,000,000 |  |  |  |  |  |
Underwriters' Over-allotment Option |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares issued | 1,125,000 |  |  |  |  |  |

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