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Significant Accounting Policies - Summary of Impact of Accounts Receivable Reserves on Gross Trade Accounts Receivable Balances (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross trade accounts receivable | $ 116,262 | $ 86,133
Accounts receivable, net | 95,398 | 66,523
Trade Allowances |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Valuation allowances and reserves | (18,512) | (19,495)
Chargebacks |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Valuation allowances and reserves | $ (2,352) | $ (115)

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