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Significant Accounting Policies - Summary of Cumulative Effect of Adoption on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Accounts receivable, net | $ 43,673 |  |  |  |
Inventories, net | 47,370 |  | $ 36,499 |  |
Total assets | 221,068 |  | 165,724 | $ 154,067 |
Income taxes payable | 710 |  | 300 |  |
Deferred revenue | 5,069 |  | 5,791 |  |
Sales allowances | 548 |  |  |  |
Total liabilities | 36,978 |  | 29,305 |  |
Retained earnings | 129,000 |  | 93,605 |  |
Total equity | 184,090 |  | 136,419 | $ 131,017 | $ 136,085
Total liabilities and equity | 221,068 |  | $ 165,724 |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Sales allowances | (548) |  |  |  |
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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