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Business Acquisition - Schedule of Unaudited Pro Forma Combined Financial Information (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Business Combinations [Abstract]  
Revenue $ 120
Operating expenses  
Research and development 9,489
General and administrative 8,317
Restructuring expense 2,282
Total operating expenses 20,088
Loss from operations (19,968)
Other income (expense), net 79
Warrant inducement expense (4,829)
Loss before provision for income taxes (24,718)
Income tax benefit 404
Net loss and other comprehensive loss $ (24,314)
Net loss per share, basic and diluted | $ / shares $ (15.44)
Weighted-average shares outstanding, basic and diluted | shares 1,574,657