Quarterly report pursuant to Section 13 or 15(d)

Employee Benefit Plan - Additional Information (Detail)

v3.10.0.1
Employee Benefit Plan - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Contribution Plan Disclosure [Line Items]        
Defined contribution plan description     The Company provides a 401(k) defined contribution plan (the Plan) for participation by all regular fulltime employees who have completed three months of service.  
Percentage of matching contribution to plan 100.00%      
Percentage of salary for matching contribution per employee 3.00%      
Percentage of additional matching contribution to plan 50.00%      
Contributions to the plan by employer $ 28 $ 22 $ 104 $ 67
Minimum [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Percentage of salary for additional matching contribution per employee 3.00%      
Maximum [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Percentage of salary for additional matching contribution per employee 5.00%