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Outstanding Debt - Additional Information (Details)
$ / shares in Units, $ in Thousands
Jun. 06, 2019
USD ($)
$ / shares
shares
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