Quarterly report pursuant to Section 13 or 15(d)

Leases - Additional Information (Detail)

v3.20.1
Leases - Additional Information (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
ft²
Facility
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]      
Weighted average remaining lease term 3 years 9 months 18 days    
Lease, option to extend option to extend for an additional 5 years    
Weighted average lease discount rate 12.60%    
Operating lease right-of-use asset $ 249   $ 235
Operating lease liability 2,054    
Short term portion of operating lease liability $ 424   407
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherAccruedLiabilitiesCurrent    
Long-term portion of operating lease liability $ 1,630   $ 1,743
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OperatingLeaseLiabilityNoncurrent    
Rent expense $ 100 $ 100  
Cash paid for operating leases $ 200 200  
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 $ 100 $ 100