Summary of Significant Accounting Policies - Additional Information (Details)
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3 Months Ended |
12 Months Ended |
Apr. 20, 2018 |
Mar. 31, 2018
USD ($)
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Mar. 31, 2017
USD ($)
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Dec. 31, 2017
USD ($)
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| Summary Of Significant Accounting Policies [Line Items] |
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| Accumulated deficit |
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$ (103,013,000)
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$ (86,880,000)
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| Net losses |
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(16,133,000)
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$ (8,934,000)
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| Net cash used in operating activities |
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(11,883,000)
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$ (7,860,000)
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| Deferred offering costs |
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$ 1,707,000
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$ 0
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| Off-balance sheet concentrations of credit risk description |
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As of March 31, 2018, the Company had no off-balance sheet concentrations of credit risk.
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| Off-balance sheet concentrations of credit risk |
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$ 0
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| Federal statutory income tax rate |
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21.00%
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35.00%
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| Limitation of net operating loss deduction as percentage of current year taxable income |
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80.00%
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| Subsequent Event |
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| Summary Of Significant Accounting Policies [Line Items] |
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| Reverse split of shares of common and convertible preferred stock, conversion ratio |
0.33898
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| Reverse split of shares of common and convertible preferred stock, effective date |
Apr. 20, 2018
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| Amended and Restated Certificate of Incorporation | Subsequent Event |
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| Summary Of Significant Accounting Policies [Line Items] |
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| Reverse split of shares of common and convertible preferred stock |
1-for-2.95 reverse split
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