Warrants - Schedule Of Fair Value Of Warrant Liability (Detail) - Liability Classified Warrant [member]	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 $ / shares	Sep. 30, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares
Class of Warrant or Right [Line Items]
Warrants Outstanding | shares			2,097,931	2,485,794
Warrant Liability			$ 34,003,000	$ 39,454,000
Change in Fair value of warrants liability	$ (5,451,000)
Bridge Financing Warrants [member]
Class of Warrant or Right [Line Items]
Strike Price | $ / shares		$ 22.90
Warrants Outstanding | shares			100,723
Warrant Liability			$ 1,089,500	2,544,500
Change in Fair value of warrants liability	(1,455,000)
Private Placement Financing Warrants [member]
Class of Warrant or Right [Line Items]
Strike Price | $ / shares		19.39
Warrants Outstanding | shares			1,606,533
Warrant Liability			$ 25,188,000	28,756,500
Change in Fair value of warrants liability	(3,568,500)
Modification Warrants [member]
Class of Warrant or Right [Line Items]
Strike Price | $ / shares		12.04
Warrants Outstanding | shares			316,947
Warrant Liability			$ 6,293,000	6,630,000
Change in Fair value of warrants liability	(337,000)
Additional Modification Warrants [member]
Class of Warrant or Right [Line Items]
Strike Price | $ / shares		$ 14.03
Warrants Outstanding | shares			73,728
Warrant Liability			$ 1,432,500	$ 1,523,000
Change in Fair value of warrants liability	$ (90,500)