Significant Accounting Policies - Summary of Cumulative Effect of Adoption on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable, net		$ 43,673
Inventories, net	$ 49,187	47,370
Total assets	240,727	221,068
Income taxes payable	57	710
Deferred revenue	5,507	5,069
Sales allowances	741	548
Total liabilities	34,857	36,978
Retained earnings	143,098	129,000
Total equity	205,870	184,090		$ 136,419	$ 131,017
Total liabilities and equity	240,727	221,068
Accounting Standards Update 2014-09 [Member]
Deferred revenue	438
Sales allowances	$ 193
Accounting Standards Update 2014-09 [Member] | Adjustments [Member]
Accounts receivable, net		(72)
Inventories, net		(110)
Total assets		(182)
Income taxes payable		(59)
Deferred revenue		5,768
Sales allowances		(483)
Total liabilities		5,226
Retained earnings		(5,408)	$ 3,670
Total equity		(5,408)
Total liabilities and equity		(182)
Accounting Standards Update 2014-09 [Member] | Balances without adoption of Topic 606 [Member]
Accounts receivable, net		43,601
Inventories, net		47,260
Total assets		220,886
Income taxes payable		651
Deferred revenue		10,837
Sales allowances		65
Total liabilities		42,204
Retained earnings		123,592
Total equity		178,682
Total liabilities and equity		$ 220,886