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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |
Restricted cash (non-current) related to letter of credit | $ 245,000 | $ 84,000
Fair value assets transferred from level 1 to level 2 | 0 | 0
Fair value assets transferred from level 2 to level 1 | 0 | 0
Fair value liabilities transferred from level 1 to level 2 | 0 | 0
Fair value liabilities transferred from level 2 to level 1 | 0 | 0
Fair value measurement with unobservable inputs reconciliation recurring basis asset transfers net | 0 | 0
Fair value measurement with unobservable inputs reconciliation recurring basis liabilities transfers net | 0 | 0
Asset impairment charges on long-lived assets | 0 |
Dividend yield | 0 |
Uncertain tax positions | 0 |
Interest charges or penalties related to unrecognized tax benefits | 0 |
Cash, cash equivalents and restricted cash at beginning of period | 7,126,000 | 53,349,000
Cash, cash equivalents and restricted cash at end of period | 34,019,000 | 7,126,000
ASU 2016-18 |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Cash, cash equivalents and restricted cash at beginning of period | $ 84,000,000 | 0
Cash, cash equivalents and restricted cash at end of period |  | $ 84,000,000

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