Revenue - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]
Contract liabilities	$ 5,573		$ 7,598
Minimum [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue payment terms	30 days
Maximum [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue payment terms	90 days
Amortization period of contract assets	1 year
Contract with customer contract period	1 year
Revenue recognition timing of invoicing period	1 year
ASU 2014-09 [Member]
Deferred Revenue Arrangement [Line Items]
Contract liabilities	$ 5,573	$ 4,088	7,598
Contract Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Accrued sales incentives	3,500		2,700
Contract Liabilities [Member] | ASU 2014-09 [Member]
Deferred Revenue Arrangement [Line Items]
Contract liabilities	$ 5,600
Contract Liabilities [Member] | ASU 2014-09 [Member] | Prior to Adoption of ASC 606 [Member]
Deferred Revenue Arrangement [Line Items]
Contract liabilities			$ 7,600
Contract Liabilities [Member] | ASU 2014-09 [Member] | Impact of Adoption of ASC 606 [Member]
Deferred Revenue Arrangement [Line Items]
Contract liabilities		$ (3,500)