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Other Balance Sheet Details - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Other Balance Sheet Details [Abstract] |  |
Accrued employee related costs | $ 38,941 | $ 27,341
Revenue-related reserves for discounts and allowances | 30,634 | 13,586
Accrued development costs | 25,496 | 7,069
Accounts payable and other accrued liabilities | 46,214 | 38,381
Total accounts payable and accrued liabilities | $ 141,285 | $ 86,377

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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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