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Outstanding Debt - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | Jun. 06, 2019 | May 05, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt instrument, warrants price per unit |  | $ 10.00
Series E Preferred Stock and Related Warrants [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, warrants price per unit | $ 1,500 |
Senior Secured Promissory Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, principal face amount | $ 2.0 |
Debt instrument maturity date | Jul. 16, 2021 |
Interest rate | 8.00% |
Series D Warrants [Member] |  |
Debt Instrument [Line Items] |  |
Number of common shares issuable on cancellation of warrants | 5,605 |
Pre-Funded Series D Warrants [Member] |  |
Debt Instrument [Line Items] |  |
Number of common shares issuable on cancellation of warrants | 100,000 |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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