Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition and Contracts with Customers (Additional Information (Detail)

v3.19.1
Revenue Recognition and Contracts with Customers (Additional Information (Detail) - USD ($)
Jun. 30, 2019
Mar. 31, 2019
Revenue, Remaining Performance Obligation   $ 970,000
Subsequent Event [Member]    
Expects to Recognize Sales in Existing Remaining Performance Obligation $ 970,000  
Extended Warranties [Member]    
Revenue, Remaining Performance Obligation   $ 148,000