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Summary of Significant Accounting Policies - Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Mar. 05, 2020 | Jan. 31, 2019
Research and development incentive income and receivable |  |  |  |  |  |  |  |
Research and development expenses reimbursed (as a percent) |  | 43.50% |  | 43.50% |  | 43.50% |  |
Adjustment to increase Australian research and development incentive income |  | $ 150 |  |  |  |  |  |
Research and development incentive income and receivable |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 836 |  |  | $ 185 | $ 836 | $ 836 |  |
Australian research and development incentive income, net |  | 228 | $ (7) | 343 | 129 | 132 |  |
Cash received for eligible expenses |  |  |  | (331) |  | (757) |  |
Foreign currency translation |  |  |  | 12 |  | (26) |  |
Balance at the end of the period |  | 209 |  | 209 |  | 185 |  |
Deferred Offering Costs |  |  |  |  |  |  |  |
Deferred Offering Costs Noncurrent |  | 379 |  | 379 |  | 831 |  |
Other Assets |  |  |  |  |  |  |  |
Deposits with service providers that are to be applied to future payments |  | $ 941 |  | 941 |  | $ 1,099 |  |
Warrant liability reclassified to equity | $ 3,448 |  |  |  | 3,448 |  |  |
Dividend attributable to down round feature of warrants |  |  |  | $ 303 | 359 |  |  |
Incremental borrowing rate |  | 8.00% |  | 8.00% |  |  |  |
2019 Public Offering |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |
Exercise price of warrant |  | $ 1.75 |  | $ 1.75 |  |  |  | $ 6.085
Dividend attributable to down round feature of warrants |  |  |  |  | $ 359 |  |  |
January 2020 Private Placement |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |
Exercise price of warrant |  | $ 1.055 |  | $ 1.055 |  |  | $ 2.11 | $ 1.75
Dividend attributable to down round feature of warrants |  |  |  | $ 303 |  |  |  |

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