The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets and Goodwill - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 3,200,000	$ 1,400,000	$ 103,000
Changes in carrying amount of goodwill		$ 0
Acquired Technology [Member] \| Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated useful life	2 years
Acquired Technology [Member] \| Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated useful life	7 years