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Collaboration Agreements and Revenues - Summary of Contra-Accounts Receivable Items Related to Product Revenue (Detail) - Product [Member] - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Disaggregation Of Revenue [Line Items] |  |
Total reductions to gross accounts receivable | $ 9,914 | $ 1,102
Price Adjustment |  |
Disaggregation Of Revenue [Line Items] |  |
Total reductions to gross accounts receivable | 529 | 936
Contractual Sales Rebate [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total reductions to gross accounts receivable | 3,479 | 148
Non-key Account Hospital Listing Award [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total reductions to gross accounts receivable | 5,238 | 0
Other Discounts and Rebates [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total reductions to gross accounts receivable | 513 | 18
Sales Return [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total reductions to gross accounts receivable | 53 | 0
Provision for Credit Loss [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total reductions to gross accounts receivable | $ 102 | $ 0

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