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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 |  |  |

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