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Accounting and Reporting Changes - Cumulative Effect of New Revenue Recognition Standard Adoption Changes on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018 | Apr. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |  |
Trade accounts receivable | $ 15,157 |  |  | $ 17,026 |  |  |
Unbilled revenue | 7,317 |  | $ 6,092 | 8,079 |  |  |
Inventories | 22,525 |  |  | 11,566 |  |  |
Prepaid expenses and other current assets | 1,671 |  |  | 772 |  |  |
Other assets | 174 |  |  | 202 |  |  |
Liabilities |  |  |  |  |  |  |
Accounts payable | 7,477 |  |  | 16,151 |  |  |
Accrued compensation | 5,186 |  |  | 4,958 |  |  |
Accrued expenses and other current liabilities | 3,822 |  |  | 2,885 |  |  |
Customer deposits | 32,572 |  | 26,585 | 13,213 |  |  |
Deferred income tax liability | 1,437 |  |  | 1,427 |  |  |
Stockholders’ equity: |  |  |  |  |  |  |
Retained earnings | 99,383 | $ 100,271 |  | $ 99,011 | $ 97,229 | $ 109,731 | $ 110,544
ASU 2014-09 [Member] |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Trade accounts receivable |  |  | 17,564 |  |  |  |
Unbilled revenue |  |  | 6,092 |  |  |  |
Inventories |  |  | 24,551 |  |  |  |
Prepaid expenses and other current assets |  |  | 890 |  |  |  |
Other assets |  |  | 271 |  |  |  |
Liabilities |  |  |  |  |  |  |
Accounts payable |  |  | 15,445 |  |  |  |
Accrued compensation |  |  | 4,786 |  |  |  |
Accrued expenses and other current liabilities |  |  | 3,369 |  |  |  |
Customer deposits |  |  | 26,585 |  |  |  |
Deferred income tax liability |  |  | 1,194 |  |  |  |
Stockholders’ equity: |  |  |  |  |  |  |
Retained earnings |  |  | 97,989 |  |  |  |
ASU 2014-09 [Member] | Adjustments Due to Adoption of Revenue Recognition Standard [Member] |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Trade accounts receivable | 1,043 |  | 538 |  |  |  |
Unbilled revenue | (778) |  | (1,987) |  |  |  |
Inventories | 13,146 |  | 12,985 |  |  |  |
Prepaid expenses and other current assets | 125 |  | 118 |  |  |  |
Other assets | 18 |  | 69 |  |  |  |
Liabilities |  |  |  |  |  |  |
Accounts payable | 73 |  | (706) |  |  |  |
Accrued compensation | (169) |  | (172) |  |  |  |
Accrued expenses and other current liabilities | (73) |  | 484 |  |  |  |
Customer deposits | 15,183 |  | 13,372 |  |  |  |
Deferred income tax liability | (295) |  | (233) |  |  |  |
Stockholders’ equity: |  |  |  |  |  |  |
Retained earnings | $ (1,167) |  | $ (1,022) |  |  |  |

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