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Leases - Schedule of Leases (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Assets    
Operating lease assets $ 5,826 $ 1,963
Total leased assets 5,826 1,963
Liabilities    
Current - Operating 717 611
Noncurrent - Operating 5,389 1,497
Total leased liabilities 6,106 2,108
Lease Cost    
Net lease cost $ 1,302 $ 858
Lease Term and Discount Rate    
Weighted-average remaining lease term (years) 5 years 2 years 7 months 6 days
Weighted-average discount rate 6.00% 7.00%
SG&A and R&D Expenses [Member]    
Lease Cost    
Operating lease cost $ 1,042 $ 708
Sublease income (45) (55)
R&D Expenses [Member]    
Lease Cost    
Short term lease cost $ 305 $ 205