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Outstanding Debt - Additional Information (Details) $ / shares in Units, $ in Thousands | Jun. 06, 2019 USD ($) $ / shares shares
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Series E Preferred Stock and Related Warrants [Member] |
Debt Instrument [Line Items] |
Debt instrument, warrants price per unit | $ / shares | $ 1,500
Senior Secured Promissory Notes [Member] |
Debt Instrument [Line Items] |
Debt instrument, principal face amount | $ | $ 2,000
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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