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Revenue from Contracts with Customers (ASC 606) Impact of New Revenue Guidance on Financial Statement Line Items (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Financial Statement Impact of Adopting ASC 606 [Line Items]            
Sales Revenue, Goods, Net $ 16,162,000 $ 14,323,000 $ 30,154,000 $ 29,186,000    
Sales Revenue, Services, Net 27,230,000 26,126,000 53,339,000 51,474,000    
Revenue, Net 43,392,000 40,449,000 83,493,000 80,660,000    
Cost of Goods Sold 10,094,000 9,295,000 19,017,000 19,834,000    
Cost of Services 15,498,000 13,094,000 29,314,000 26,362,000    
Research and Development Expense 3,565,000 3,761,000 7,499,000 7,708,000    
Selling and Marketing Expense 8,494,000 8,124,000 17,435,000 16,864,000    
General and Administrative Expense 6,928,000 7,543,000 14,595,000 15,730,000    
Costs and Expenses 44,579,000 41,817,000 87,860,000 86,498,000    
Operating Income (Loss) (1,187,000) (1,368,000) (4,367,000) (5,838,000)    
Net interest and other expense 173,000 (302,000) (362,000) (557,000)    
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (1,014,000) (1,670,000) (4,729,000) (6,395,000)    
Income tax expense 329,000 356,000 507,000 516,000    
Cash, Cash Equivalents, and Short-term Investments 34,872,000   34,872,000      
Accounts receivable, net of allowance for doubtful accounts of $2,489 and $2,852 as of June 30, 2018 and December 31, 2017, respectively 29,837,000   29,837,000     $ 28,316,000
Inventories 22,912,000   22,912,000     22,732,000
Current contract assets 3,419,000   3,419,000     0
Prepaid Expense and Other Assets 3,339,000   3,339,000     3,816,000
Long-Lived Assets 96,049,000   96,049,000      
Other Assets, Noncurrent 6,735,000   6,735,000     5,927,000
Non-current contract assets 6,266,000   6,266,000     0
Non-current deferred income tax asset 198,000   198,000     20,000
Assets 203,627,000   203,627,000     196,239,000
Accounts Payable and Other Accrued Liabilities, Current 38,403,000   38,403,000      
Deferred Revenue, Current 0   0     6,919,000
Contract liabilities 11,051,000   11,051,000     0
Long-term contract liabilities 8,374,000   8,374,000     0
Deferred Income Taxes and Other Liabilities, Noncurrent 4,793,000   4,793,000      
Long-term Debt, Excluding Current Maturities 38,575,000   38,575,000     44,572,000
Liabilities 101,196,000   $ 101,196,000     90,574,000
Subscriber Relationship, Estimated Life     5 years      
Revenues 43,392,000   $ 83,493,000      
Retained Earnings (Accumulated Deficit) (12,401,000)   (12,401,000)     (4,417,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss 114,832,000   114,832,000      
Stockholders' Equity Attributable to Parent 102,431,000   102,431,000     105,665,000
Liabilities and Equity 203,627,000   203,627,000     196,239,000
Net Income (Loss) Attributable to Parent $ (1,343,000) $ (2,026,000) $ (5,236,000) $ (6,911,000)    
Earnings Per Share, Basic and Diluted $ (0.08) $ (0.12) $ (0.31) $ (0.42)    
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities     $ 7,821,000      
Increase (Decrease) in Accounts Receivable and Inventories     (1,856,000)      
Increase (Decrease) in Prepaid Expense and Other Assets     (1,022,000)      
Increase (Decrease) in Deferred Revenue     527,000      
Increase (Decrease) in Accounts Payable and Other Operating Liabilities     (1,432,000)      
Net Cash Provided by (Used in) Operating Activities     (1,198,000) $ 6,772,000    
Deferred Revenue, Revenue Recognized $ 1,193,000   2,408,000      
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]            
Financial Statement Impact of Adopting ASC 606 [Line Items]            
Cash, Cash Equivalents, and Short-term Investments         $ 42,915,000 0
Accounts receivable, net of allowance for doubtful accounts of $2,489 and $2,852 as of June 30, 2018 and December 31, 2017, respectively         28,316,000 0
Inventories         22,732,000 0
Current contract assets         3,205,000 3,205,000
Prepaid Expense and Other Assets         3,816,000 0
Long-Lived Assets         92,513,000 0
Other Assets, Noncurrent         5,927,000 0
Non-current contract assets         5,963,000 5,963,000
Non-current deferred income tax asset         222,000 202,000
Assets 9,862,000   9,862,000   205,609,000 9,370,000
Accounts Payable and Other Accrued Liabilities, Current         36,430,000 0
Deferred Revenue, Current         0 (6,919,000)
Contract liabilities         11,039,000 11,039,000
Long-term contract liabilities         7,998,000 7,998,000
Long-term Debt, Excluding Current Maturities         44,572,000 0
Liabilities 12,709,000   12,709,000   102,692,000 12,118,000
Revenues 182,000   590,000      
Cost of Revenue 67,000   476,000      
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
Stockholders' Equity Attributable to Parent         102,917,000 (2,748,000)
Liabilities and Equity         $ 205,609,000 9,370,000
Net Income (Loss) Attributable to Parent $ 89,000   $ 98,000      
Earnings Per Share, Basic and Diluted $ (0.01)   $ (0.01)      
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Financial Statement Impact of Adopting ASC 606 [Line Items]            
Sales Revenue, Goods, Net $ 16,344,000   $ 30,744,000      
Sales Revenue, Services, Net 27,230,000   53,339,000      
Revenue, Net 43,574,000   84,083,000      
Cost of Goods Sold 10,161,000   19,493,000      
Cost of Services 15,498,000   29,314,000      
Research and Development Expense 3,565,000   7,499,000      
Selling and Marketing Expense 8,536,000   17,476,000      
General and Administrative Expense 6,928,000   14,595,000      
Costs and Expenses 44,688,000   88,377,000      
Operating Income (Loss) (1,114,000)   (4,294,000)      
Net interest and other expense 173,000   (362,000)      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (941,000)   (4,656,000)      
Income tax expense 313,000   482,000      
Cash, Cash Equivalents, and Short-term Investments 34,872,000   34,872,000     42,915,000
Accounts receivable, net of allowance for doubtful accounts of $2,489 and $2,852 as of June 30, 2018 and December 31, 2017, respectively 29,837,000   29,837,000     28,316,000
Inventories 22,912,000   22,912,000     22,732,000
Current contract assets 0   0     0
Prepaid Expense and Other Assets 3,339,000   3,339,000     3,816,000
Long-Lived Assets 96,049,000   96,049,000     92,513,000
Other Assets, Noncurrent 6,735,000   6,735,000     5,927,000
Non-current contract assets 0   0     0
Non-current deferred income tax asset 21,000   21,000     20,000
Assets 193,765,000   193,765,000     196,239,000
Accounts Payable and Other Accrued Liabilities, Current 38,403,000   38,403,000     36,430,000
Deferred Revenue, Current 6,716,000   6,716,000     6,919,000
Contract liabilities 0   0     0
Long-term contract liabilities 0   0     0
Deferred Income Taxes and Other Liabilities, Noncurrent 4,793,000   4,793,000      
Long-term Debt, Excluding Current Maturities 38,575,000   38,575,000     44,572,000
Liabilities 88,487,000   88,487,000     90,574,000
Retained Earnings (Accumulated Deficit) (9,554,000)   (9,554,000)     (4,417,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss 114,832,000   114,832,000     110,082,000
Stockholders' Equity Attributable to Parent 105,278,000   105,278,000     105,665,000
Liabilities and Equity 193,765,000   193,765,000     $ 196,239,000
Net Income (Loss) Attributable to Parent $ (1,254,000)   $ (5,138,000)      
Earnings Per Share, Basic and Diluted $ (0.07)   $ (0.30)      
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities     $ 7,796,000      
Increase (Decrease) in Accounts Receivable and Inventories     (1,856,000)      
Increase (Decrease) in Prepaid Expense and Other Assets     (505,000)      
Increase (Decrease) in Deferred Revenue     (63,000)      
Increase (Decrease) in Accounts Payable and Other Operating Liabilities     (1,432,000)      
Net Cash Provided by (Used in) Operating Activities     $ (1,198,000)