Quarterly report pursuant to Section 13 or 15(d)

Leases - Additional Information (Detail)

v3.19.3
Leases - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Facility
Sep. 30, 2019
USD ($)
ft²
Facility
Lessee Lease Description [Line Items]    
Weighted average remaining lease term 4 years 3 months 18 days 4 years 3 months 18 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 $ 219 $ 219
Operating lease liability 2,240 2,240
Short term portion of operating lease liability $ 389 $ 389
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:OtherAccruedLiabilitiesCurrent
Long-term portion of operating lease liability $ 1,851 $ 1,851
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:OperatingLeaseLiabilityNoncurrent
Rent expenses $ 100 $ 300
Operating Expense [Member]    
Lessee Lease Description [Line Items]    
Lease costs $ 200 $ 400
Lease Facility [Member]    
Lessee Lease Description [Line Items]    
Number of leased facilities | Facility 1 1
Area of office space | ft²   17,698
Lease start date   Jan. 16, 2014