Annual report pursuant to Section 13 and 15(d)

Commitments (Additional Information) (Detail)

v3.19.1
Commitments (Additional Information) (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitment Contingencies Disclosure [Line Items]      
Lease Expiration Date Oct. 03, 2020    
Operating Leases, Rent Expense, Minimum Rentals $ 516,766    
Operating Leases, Rent Expense $ 462,711 $ 461,246 $ 482,147
Operating Lease Commencement Date Oct. 03, 2015    
Lessee Leasing Arrangements, Operating Leases, Renewal Term 3 years    
Purchase Obligation $ 6,500,000    
Minimum [Member]      
Commitment Contingencies Disclosure [Line Items]      
Area of Land | ft² 29,152    
Maximum [Member]      
Commitment Contingencies Disclosure [Line Items]      
Area of Land | ft² 39,152    
SPAIN      
Commitment Contingencies Disclosure [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 5 years    
JAPAN      
Commitment Contingencies Disclosure [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 2 years    
UNITED KINGDOM      
Commitment Contingencies Disclosure [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 2 years