Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Summary of Quantitative Information Associated with Amounts Recognized in Unaudited Condensed Consolidated Financial Statements for Lease (Detail)

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Commitments and Contingencies - Summary of Quantitative Information Associated with Amounts Recognized in Unaudited Condensed Consolidated Financial Statements for Lease (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 01, 2018
Sep. 30, 2019
Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]      
Operating lease cost   $ 166 $ 498
Variable lease cost   8 25
Total operating lease expense   174 523
Total lease payments $ 7,300 $ 111 $ 330
Remaining Lease term (years)   9 years 10 months 2 days 9 years 10 months 2 days
Discount rate   15.00% 15.00%