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Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 02, 2018
Assets |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 43,794 |  |  |  | $ 32,531 |  |  |  | $ 43,794 | $ 32,531 | $ 38,522
Inventories | 9,827 |  |  |  | 13,799 |  |  |  | 9,827 | 13,799 | 7,870
Assets of discontinued operation |  |  |  |  | 20,651 |  |  |  |  | 20,651 | 20,294
Liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred revenue and customer deposits | 912 |  |  |  | 3,342 |  |  |  | 912 | 3,342 | 279
Liabilities of discontinued operation |  |  |  |  | 5,669 |  |  |  |  | 5,669 | 5,134
Deferred income taxes | 5,749 |  |  |  | 12,168 |  |  |  | 5,749 | 12,168 | 12,647
Stockholders' deficit: |  |  |  |  |  |  |  |  |  |  |
Accumulated (loss) earnings | (36,004) |  |  |  | (1,366) |  |  |  | (36,004) | (1,366) | 1,458
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales | 68,516 | $ 70,987 | $ 61,454 | $ 54,857 | 57,489 | $ 60,997 | $ 54,836 | $ 50,422 | 255,814 | 223,744 |
Cost of sales: |  |  |  |  |  |  |  |  |  |  |
Gross profit | 20,979 | 23,308 | 19,875 | 14,428 | 17,447 | 19,444 | 16,666 | 14,648 | 78,590 | 68,205 |
Income tax benefit |  |  |  |  |  |  |  |  | 4,339 | 16,536 |
Net loss from continuing operations | (7,235) | $ (1,085) | $ (802) | $ (5,677) | (14,416) | $ (798) | $ (3,273) | $ (4,598) | (14,799) | (23,085) |
Net (loss) income from discontinued operation, net of taxes |  |  |  |  |  |  |  |  | (22,663) | 1,075 |
Balance without adoption of ASU 2014-09 | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 36,286 |  |  |  | 32,531 |  |  |  | 36,286 | 32,531 |
Inventories | 17,177 |  |  |  | 13,799 |  |  |  | 17,177 | 13,799 |
Assets of discontinued operation |  |  |  |  | 20,651 |  |  |  |  | 20,651 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred revenue and customer deposits | 2,805 |  |  |  | 3,342 |  |  |  | 2,805 | 3,342 |
Liabilities of discontinued operation |  |  |  |  | 5,669 |  |  |  |  | 5,669 |
Deferred income taxes | 5,182 |  |  |  | 12,168 |  |  |  | 5,182 | 12,168 |
Stockholders' deficit: |  |  |  |  |  |  |  |  |  |  |
Accumulated (loss) earnings | (37,488) |  |  |  | $ (1,366) |  |  |  | (37,488) | (1,366) |
Cost of sales: |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 78,402 |  |
Income tax benefit |  |  |  |  |  |  |  |  | 4,378 |  |
Net loss from continuing operations |  |  |  |  |  |  |  |  | (14,948) |  |
Net (loss) income from discontinued operation, net of taxes |  |  |  |  |  |  |  |  | (22,506) |  |
Adjustment | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 7,508 |  |  |  |  |  |  |  | 7,508 |  | 5,991
Inventories | (7,350) |  |  |  |  |  |  |  | (7,350) |  | (5,929)
Assets of discontinued operation |  |  |  |  |  |  |  |  |  |  | (357)
Liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred revenue and customer deposits | (1,893) |  |  |  |  |  |  |  | (1,893) |  | (3,063)
Liabilities of discontinued operation |  |  |  |  |  |  |  |  |  |  | (535)
Deferred income taxes | 567 |  |  |  |  |  |  |  | 567 |  | 479
Stockholders' deficit: |  |  |  |  |  |  |  |  |  |  |
Accumulated (loss) earnings | $ 1,484 |  |  |  |  |  |  |  | 1,484 |  | $ 2,824
Cost of sales: |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 188 |  |
Income tax benefit |  |  |  |  |  |  |  |  | (39) |  |
Net loss from continuing operations |  |  |  |  |  |  |  |  | 149 |  |
Net (loss) income from discontinued operation, net of taxes |  |  |  |  |  |  |  |  | (157) |  |
Products |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 125,069 | 104,459 |
Cost of sales: |  |  |  |  |  |  |  |  |  |  |
Products (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | 82,110 | 70,527 |
Products | Balance without adoption of ASU 2014-09 | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 123,266 |  |
Cost of sales: |  |  |  |  |  |  |  |  |  |  |
Products (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | 80,372 |  |
Products | Adjustment | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,803 |  |
Cost of sales: |  |  |  |  |  |  |  |  |  |  |
Products (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | 1,738 |  |
Services |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 130,745 | 119,285 |
Cost of sales: |  |  |  |  |  |  |  |  |  |  |
Services (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | 82,697 | $ 74,315 |
Services | Balance without adoption of ASU 2014-09 | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 131,132 |  |
Cost of sales: |  |  |  |  |  |  |  |  |  |  |
Services (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | 83,207 |  |
Services | Adjustment | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (387) |  |
Cost of sales: |  |  |  |  |  |  |  |  |  |  |
Services (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | $ (510) |  |

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