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Accounting and Repoting Changes - Cumulative Effect of New Revenue Recognition Standard Adoption Changes on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Apr. 01, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Mar. 31, 2017
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Trade accounts receivable | $ 12,698 |  | $ 17,026 |  |
Unbilled revenue | 11,844 | $ 6,092 | 8,079 |  |
Inventories | 19,323 |  | 11,566 |  |
Prepaid expenses and other current assets | 1,342 |  | 772 |  |
Other assets | 221 |  | 202 |  |
Liabilities |  |  |  |  |
Accounts payable | 8,296 |  | 16,151 |  |
Accrued compensation | 5,001 |  | 4,958 |  |
Accrued expenses and other current liabilities | 3,469 |  | 2,885 |  |
Customer deposits | 25,867 | 26,585 | 13,213 |  |
Deferred income tax liability | 1,417 |  | 1,427 |  |
Stockholders’ equity: |  |  |  |  |
Retained earnings | 99,427 |  | $ 99,011 | $ 110,600 | $ 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 | 680 | 538 |  |  |
Unbilled revenue | (555) | (1,987) |  |  |
Inventories | 10,121 | 12,985 |  |  |
Prepaid expenses and other current assets | 113 | 118 |  |  |
Other assets | 34 | 69 |  |  |
Liabilities |  |  |  |  |
Accounts payable | 3 | (706) |  |  |
Accrued compensation | (200) | (172) |  |  |
Accrued expenses and other current liabilities | (71) | 484 |  |  |
Customer deposits | 11,732 | 13,372 |  |  |
Deferred income tax liability | (222) | (233) |  |  |
Stockholders’ equity: |  |  |  |  |
Retained earnings | $ (749) | $ (1,022) |  |  |

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