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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)