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Collaboration Agreements and Revenues - Summary of Contra-Accounts Receivable Items Related to Product Revenue (Detail) - Product [Member] - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Disaggregation Of Revenue [Line Items]    
Total reductions to gross accounts receivable $ 5,724 $ 1,102
Price Adjustment    
Disaggregation Of Revenue [Line Items]    
Total reductions to gross accounts receivable 935 936
Contractual Sales Rebate [Member]    
Disaggregation Of Revenue [Line Items]    
Total reductions to gross accounts receivable 1,878 148
Non-key Account Hospital Listing Award [Member]    
Disaggregation Of Revenue [Line Items]    
Total reductions to gross accounts receivable 2,567 0
Other Discounts and Rebates [Member]    
Disaggregation Of Revenue [Line Items]    
Total reductions to gross accounts receivable 260 18
Provision for Credit Loss [Member]    
Disaggregation Of Revenue [Line Items]    
Total reductions to gross accounts receivable $ 84 $ 0