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Asset Acquisition and Business Combination - Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 18, 2019
Jun. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill   $ 12,026 $ 12,026
Rhythm Xience [Member]      
Business Acquisition [Line Items]      
Accounts receivable, net   3  
Prepaid expenses and other current assets   8  
Property and equipment, net   3  
Intangible assets   4,360  
Goodwill   12,026  
Contingent consideration $ (7,500) (13,400)  
Cash consideration $ 3,000 $ 3,000