Annual report pursuant to Section 13 and 15(d)

Leases - Additional Information (Detail)

v3.21.1
Leases - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
ft²
Facility
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Weighted average remaining lease term 3 years 1 month 6 days 4 years 1 month 6 days
Lease, option to extend option to extend for an additional 5 years  
Weighted average lease discount rate 12.60% 12.60%
Operating lease right-of-use asset $ 272 $ 235
Operating lease liability 1,744 2,100
Short term portion of operating lease liability $ 482 $ 407
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other accrued liabilities Other accrued liabilities
Long-term portion of operating lease liability $ 1,262 $ 1,743
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term portion of operating lease liability Long-term portion of operating lease liability
Lease Facility [Member]    
Lessee, Lease, Description [Line Items]    
Number of leased facilities | Facility 1  
Area of office space | ft² 17,698  
Lease start date Jan. 16, 2014  
Operating Expense [Member]    
Lessee, Lease, Description [Line Items]    
Lease costs $ 500 $ 500