XML 39 R28.htm IDEA: XBRL DOCUMENT v3.20.1
Summary of Significant Accounting Policies - Summary of Product Revenue by Geographical Locations of Customers (Detail) - Product - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation Of Revenue [Line Items]    
Total product revenue $ 18,611 $ 17,504
Europe, Middle East and Africa    
Disaggregation Of Revenue [Line Items]    
Total product revenue 12,220 12,653
North America    
Disaggregation Of Revenue [Line Items]    
Total product revenue 6,077 4,551
Other    
Disaggregation Of Revenue [Line Items]    
Total product revenue $ 314 $ 300