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Summary of Significant Accounting Policies - Net Loss Per Share (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) segment shares | Dec. 31, 2018 shares | Nov. 30, 2019 USD ($) | Jan. 01, 2019 USD ($)
Antidilutive common stock equivalents excluded from computation of diluted net loss per share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) | shares | 6,979,581 | 4,635,838 |  |
Segment Information |  |  |  |
Number of operating segments | segment | 1 |  |  |
Operating Lease, Right-of-Use Asset | $ 2,349 |  | $ 1,700 |
Operating Lease, Liability, Current | $ 1,225 |  |  |
Operating Lease, Weighted Average Discount Rate, Percent |  |  | 7.49% |
Stock options |  |  |  |
Antidilutive common stock equivalents excluded from computation of diluted net loss per share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) | shares | 785,832 | 433,389 |  |
Common stock warrants |  |  |  |
Antidilutive common stock equivalents excluded from computation of diluted net loss per share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) | shares | 6,193,749 | 4,202,449 |  |
Restatement adjustment | AccountingStandardsUpdate201602Member |  |  |  |
Segment Information |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 1,900
Operating Lease, Liability, Current |  |  |  | $ 1,900
Operating Lease, Weighted Average Discount Rate, Percent |  |  |  | 7.49%

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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