Revenue - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Aug. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014
Revenues [Line Items]
Long-term trade receivables		$ 200,000	$ 400,000
Long-term trade credit maintenance services term		1 year
Allowance for doubtful accounts		$ 0	0
Deferred revenue, recognized		10,900,000	$ 19,900,000	$ 6,600,000
Company recognized revenue from performance obligations satisfied in a prior period		$ 900,000
Minimum
Revenues [Line Items]
Expected long-term trade receivables collection period		3 years
Maximum
Revenues [Line Items]
Expected long-term trade receivables collection period		4 years
Itochu Corporation Agreement
Revenues [Line Items]
Remaining term of distribution agreement	8 years 6 months
Itochu Corporation Agreement | Distribution Rights
Revenues [Line Items]
Distribution revenue reclassified as deferred revenue					$ 4,000,000