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ASC 606 and Business and Credit Concentrations Impact of New Revenue Guidance on Financial Statement Line Items (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash, cash equivalent and marketable securities $ 41,100,000      
Accounts receivable, net 28,550,000     $ 28,316,000
Inventories 23,327,000     22,732,000
Contract assets 3,305,000     0
Prepaid expenses and other current assets 4,419,000     3,816,000
Long-lived assets 97,728,000      
Other non-current assets 6,437,000     5,927,000
Contract assets, long-term 6,272,000     0
Non-current deferred income tax asset 214,000     20,000
Assets 211,352,000     196,239,000
Accounts payable, accrued expenses, and other current liabilities 37,400,000      
Contract liabilities 11,973,000     0
Long-term contract liabilities 8,301,000     0
Deferred Income Taxes and Other Liabilities, Noncurrent 5,143,000      
Other long-term liabilities 2,414,000     19,000
Long-term debt, excluding current portion 41,701,000     44,572,000
Liabilities 104,518,000     90,574,000
Retained Earnings (Accumulated Deficit) (11,058,000)     (4,417,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss 117,892,000      
Total stockholders’ equity 106,834,000     105,665,000
Total liabilities and stockholders’ equity 211,352,000     196,239,000
Sales Revenue, Goods, Net 13,992,000 $ 14,863,000    
Sales Revenue, Services, Net 26,109,000 25,348,000    
Revenues 40,101,000      
Revenue, Net 40,101,000 40,211,000    
Cost of Goods Sold 8,923,000 10,539,000    
Cost of Services 13,816,000 13,268,000    
Research and Development Expense 3,934,000 3,947,000    
Selling and Marketing Expense 8,941,000 8,740,000    
General and Administrative Expense 7,667,000 8,187,000    
Costs and Expenses 43,281,000 44,681,000    
Operating Income (Loss) (3,180,000) (4,470,000)    
Net interest and other expense (535,000) (255,000)    
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (3,715,000) (4,725,000)    
Interest expense 409,000 353,000    
Other expense, net (274,000) (68,000)    
Income tax expense 178,000 160,000    
Net loss (3,893,000) $ (4,885,000)    
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities $ 3,980,000      
Earnings Per Share, Basic and Diluted $ (0.23) $ (0.30)    
Increase (Decrease) in Accounts Receivable and Inventories $ (649,000)      
Increase (Decrease) in Prepaid Expense and Other Assets (1,487,000)      
Increase (Decrease) in Deferred Revenue 1,094,000 $ 454,000    
Increase (Decrease) in Accounts Payable and Other Operating Liabilities (242,000)      
Net Cash Provided by (Used in) Operating Activities (1,197,000) $ 4,345,000    
Deferred Revenue, Revenue Recognized 1,215,000      
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash, cash equivalent and marketable securities     $ 42,915,000 0
Accounts receivable, net     28,316,000 0
Inventories     22,732,000 0
Contract assets     3,205,000 3,205,000
Prepaid expenses and other current assets     3,816,000 0
Long-lived assets     92,513,000 0
Other non-current assets     5,927,000 0
Contract assets, long-term     5,963,000 5,963,000
Non-current deferred income tax asset     222,000 202,000
Assets 9,770,000   205,609,000 9,370,000
Accounts payable, accrued expenses, and other current liabilities     36,430,000 0
Contract liabilities     11,039,000 11,039,000
Long-term contract liabilities     7,998,000 7,998,000
Other long-term liabilities     2,653,000 0
Long-term debt, excluding current portion     44,572,000 0
Liabilities 12,526,000   102,692,000 12,118,000
Retained Earnings (Accumulated Deficit)     (7,165,000) (2,748,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss     110,082,000 0
Total stockholders’ equity     102,917,000 (2,748,000)
Total liabilities and stockholders’ equity     $ 205,609,000 9,370,000
Revenues 408,000      
Net loss 9,000      
Cost of Revenue 409,000      
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Sales Commission [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Retained Earnings (Accumulated Deficit)       191,000
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash, cash equivalent and marketable securities 41,100,000     42,915,000
Accounts receivable, net 28,550,000     28,316,000
Inventories 23,327,000     22,732,000
Contract assets 0     0
Prepaid expenses and other current assets 4,419,000     3,816,000
Long-lived assets 97,728,000     92,513,000
Other non-current assets 6,437,000     5,927,000
Contract assets, long-term 0     0
Non-current deferred income tax asset 21,000     20,000
Assets 201,582,000     196,239,000
Accounts payable, accrued expenses, and other current liabilities 37,400,000     36,430,000
Contract liabilities 0     0
Long-term contract liabilities 0     0
Deferred Income Taxes and Other Liabilities, Noncurrent 5,143,000      
Other long-term liabilities       2,653,000
Long-term debt, excluding current portion 41,701,000     44,572,000
Liabilities 91,992,000     90,574,000
Retained Earnings (Accumulated Deficit) (8,302,000)     (4,417,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss 117,892,000     110,082,000
Total stockholders’ equity 109,590,000     105,665,000
Total liabilities and stockholders’ equity 201,582,000     $ 196,239,000
Sales Revenue, Goods, Net 14,400,000      
Sales Revenue, Services, Net 26,109,000      
Revenue, Net 40,509,000      
Cost of Goods Sold 9,332,000      
Cost of Services 13,816,000      
Research and Development Expense 3,934,000      
Selling and Marketing Expense 8,940,000      
General and Administrative Expense 7,667,000      
Costs and Expenses 43,689,000      
Operating Income (Loss) (3,180,000)      
Net interest and other expense (535,000)      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (3,715,000)      
Income tax expense 169,000      
Net loss (3,884,000)      
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities $ 3,971,000      
Earnings Per Share, Basic and Diluted $ (0.23)      
Increase (Decrease) in Accounts Receivable and Inventories $ (649,000)      
Increase (Decrease) in Prepaid Expense and Other Assets (1,079,000)      
Increase (Decrease) in Deferred Revenue 686,000      
Increase (Decrease) in Accounts Payable and Other Operating Liabilities (242,000)      
Net Cash Provided by (Used in) Operating Activities $ (1,197,000)