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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | --- | ---
Restricted Cash and Cash Equivalents Items |  |  |  |
Restricted cash | $ 787 | $ 105 | $ 105 | $ 0
Letter of credit collateral |  |  |  |
Restricted Cash and Cash Equivalents Items |  |  |  |
Restricted cash | 600 |  |  |
Security deposit |  |  |  |
Restricted Cash and Cash Equivalents Items |  |  |  |
Restricted cash | $ 200 |  |  |

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- Definition Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 + Details
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