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Redeemable Convertible Preferred Stock - Series A - Summary of Reconciliation of Carrying Value of Series A Preferred Stock (Details) - USD ($)
$ in Thousands
 8 Months Ended 9 Months Ended
Dec. 31, 2017
Sep. 30, 2018
Temporary Equity Disclosure [Abstract]    
Gross proceeds from Series A Preferred offering $ 20,055 $ 20,055
Issuance costs - cash (2,055) (2,055)
Issuance costs - common stock warrants (479) (479)
Accrued dividends on Series A Preferred 643 1,543
Deemed dividends for accretion of Series A Preferred issuance costs 840 2,097
Balance as of the end of the period $ 19,004 $ 21,161