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Summary of Significant Accounting Policies - Warrants and Fair Value of Financial Instruments (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 05, 2020 | Jan. 31, 2019
Warrants |  |  |  |  |
Warrant, equity component | $ 3,448 |  | $ 3,448 |  |
Dividend attributable to down round feature of warrants |  | $ 303 | 359 |  |
Assets: |  |  |  |  |
Cash equivalents |  | 51,116 | 3,891 |  |
Total assets |  | 51,116 | 3,891 |  |
Liabilities: |  |  |  |  |
Restricted stock liability |  | 204 | 159 |  |
Total liabilities |  | 204 | 159 |  |
2019 Public Offering |  |  |  |  |
Warrants |  |  |  |  |
Dividend attributable to down round feature of warrants |  |  | $ 359 |  |
Exercise price of warrant |  |  | $ 1.75 |  | $ 6.085
January 2020 Private Placement |  |  |  |  |
Warrants |  |  |  |  |
Dividend attributable to down round feature of warrants |  | $ 303 |  |  |
Exercise price of warrant |  | $ 1.055 |  | $ 2.11 | $ 1.75
Level 1 |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  | $ 51,116 | $ 3,891 |  |
Total assets |  | 51,116 | 3,891 |  |
Level 2 |  |  |  |  |
Liabilities: |  |  |  |  |
Restricted stock liability |  | 204 | 159 |  |
Total liabilities |  | $ 204 | $ 159 |  |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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