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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 | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Financial Statement Impact of Adopting ASC 606 [Line Items] |  |  |  |  |  |
Sales Revenue, Goods, Net | $ 16,367,000 | $ 14,169,000 | $ 46,521,000 | $ 43,355,000 |  |
Sales Revenue, Services, Net | 27,150,000 | 26,281,000 | 80,489,000 | 77,755,000 |  |
Revenue, Net | 43,517,000 | 40,450,000 | 127,010,000 | 121,110,000 |  |
Cost of Goods Sold | 9,767,000 | 9,578,000 | 28,784,000 | 29,412,000 |  |
Cost of Services | 15,376,000 | 13,374,000 | 44,690,000 | 39,736,000 |  |
Research and Development Expense | 3,789,000 | 3,990,000 | 11,288,000 | 11,698,000 |  |
Selling and Marketing Expense | 8,421,000 | 8,234,000 | 25,856,000 | 25,098,000 |  |
General and Administrative Expense | 7,084,000 | 7,075,000 | 21,679,000 | 22,805,000 |  |
Costs and Expenses | 44,437,000 | 42,251,000 | 132,297,000 | 128,749,000 |  |
Operating Income (Loss) | (920,000) | (1,801,000) | (5,287,000) | (7,639,000) |  |
Net interest and other expense | (93,000) | (354,000) | (455,000) | (911,000) |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (1,013,000) | (2,155,000) | (5,742,000) | (8,550,000) |  |
Income tax expense | 161,000 | 283,000 | 668,000 | 799,000 |  |
Cash, Cash Equivalents, and Short-term Investments | 33,236,000 |  | 33,236,000 |  |  | $ 42,915,000
Accounts receivable, net of allowance for doubtful accounts of $2,786 and $2,852 as of September 30, 2018 and December 31, 2017, respectively | 28,971,000 |  | 28,971,000 |  |  | 28,316,000
Inventories | 24,676,000 |  | 24,676,000 |  |  | 22,732,000
Current contract assets | 3,460,000 |  | 3,460,000 |  | $ 3,205,000 | 0
Prepaid Expense and Other Assets | 3,741,000 |  | 3,741,000 |  |  | 3,816,000
Long-Lived Assets | 96,860,000 |  | 96,860,000 |  |  | 92,513,000
Other Assets, Noncurrent | 6,701,000 |  | 6,701,000 |  |  | 5,927,000
Non-current contract assets | 6,626,000 |  | 6,626,000 |  | 5,963,000 | 0
Non-current deferred income tax asset | 201,000 |  | 201,000 |  |  | 20,000
Assets | 204,472,000 |  | 204,472,000 |  |  | 196,239,000
Accounts Payable and Other Accrued Liabilities, Current | 58,342,000 |  | 58,342,000 |  |  | 36,430,000
Deferred Revenue, Current | 0 |  | 0 |  |  | 6,919,000
Contract liabilities | 10,770,000 |  | 10,770,000 |  | 11,039,000 | 0
Long-term contract liabilities | 8,771,000 |  | 8,771,000 |  | 7,998,000 | 0
Deferred Income Taxes and Other Liabilities, Noncurrent | 4,607,000 |  | 4,607,000 |  |  |
Long-term Debt, Excluding Current Maturities | 20,252,000 |  | 20,252,000 |  |  | 44,572,000
Liabilities | 102,742,000 |  | $ 102,742,000 |  |  | 90,574,000
Subscriber Relationship, Estimated Life |  |  | 5 years |  |  |
Retained Earnings (Accumulated Deficit) | (13,575,000) |  | $ (13,575,000) |  |  | (4,417,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss | 115,305,000 |  | 115,305,000 |  |  | 110,082,000
Stockholders' Equity Attributable to Parent | 101,730,000 |  | 101,730,000 |  |  | 105,665,000
Liabilities and Equity | 204,472,000 |  | 204,472,000 |  |  | 196,239,000
Net Income (Loss) Attributable to Parent | $ (1,174,000) | $ (2,438,000) | $ (6,410,000) | $ (9,349,000) |  |
Earnings Per Share, Basic and Diluted | $ (0.07) | $ (0.15) | $ (0.38) | $ (0.57) |  |
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities |  |  | $ 12,111,000 |  |  |
Increase (Decrease) in Accounts Receivable and Inventories |  |  | (3,124,000) |  |  |
Increase (Decrease) in Prepaid Expense and Other Assets |  |  | (1,879,000) |  |  |
Increase (Decrease) in Deferred Revenue |  |  | 701,000 |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities |  |  | 362,000 |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | 1,761,000 | $ 9,391,000 |  |
Deferred Revenue, Revenue Recognized | $ 1,117,000 |  | 3,525,000 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
Financial Statement Impact of Adopting ASC 606 [Line Items] |  |  |  |  |  |
Cash, Cash Equivalents, and Short-term Investments |  |  |  |  | 42,915,000 |
Accounts receivable, net of allowance for doubtful accounts of $2,786 and $2,852 as of September 30, 2018 and December 31, 2017, respectively |  |  |  |  | 28,316,000 |
Inventories |  |  |  |  | 22,732,000 |
Current contract assets |  |  |  |  | 3,205,000 |
Prepaid Expense and Other Assets |  |  |  |  | 3,816,000 |
Long-Lived Assets |  |  |  |  | 92,513,000 |
Other Assets, Noncurrent |  |  |  |  | 5,927,000 |
Non-current contract assets |  |  |  |  | 5,963,000 |
Non-current deferred income tax asset |  |  |  |  | 222,000 |
Assets |  |  |  |  | 205,609,000 |
Accounts Payable and Other Accrued Liabilities, Current |  |  |  |  | 36,430,000 |
Deferred Revenue, Current |  |  |  |  | 0 |
Contract liabilities |  |  |  |  | 11,039,000 |
Long-term contract liabilities |  |  |  |  | 7,998,000 |
Long-term Debt, Excluding Current Maturities |  |  |  |  | 44,572,000 |
Liabilities |  |  |  |  | 102,692,000 |
Retained Earnings (Accumulated Deficit) |  |  |  |  | (7,165,000) |
Common stock, additional paid-in capital, and accumulated other comprehensive loss |  |  |  |  | 110,082,000 |
Stockholders' Equity Attributable to Parent |  |  |  |  | 102,917,000 |
Liabilities and Equity |  |  |  |  | $ 205,609,000 |
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 |  |  |  |  |  | 0
Accounts receivable, net of allowance for doubtful accounts of $2,786 and $2,852 as of September 30, 2018 and December 31, 2017, respectively |  |  |  |  |  | 0
Inventories |  |  |  |  |  | 0
Current contract assets |  |  |  |  |  | 3,205,000
Prepaid Expense and Other Assets |  |  |  |  |  | 0
Long-Lived Assets |  |  |  |  |  | 0
Other Assets, Noncurrent |  |  |  |  |  | 0
Non-current contract assets |  |  |  |  |  | 5,963,000
Non-current deferred income tax asset |  |  |  |  |  | 202,000
Assets | 10,241,000 |  | 10,241,000 |  |  | 9,370,000
Accounts Payable and Other Accrued Liabilities, Current |  |  |  |  |  | 0
Deferred Revenue, Current |  |  |  |  |  | (6,919,000)
Contract liabilities |  |  |  |  |  | 11,039,000
Long-term contract liabilities |  |  |  |  |  | 7,998,000
Long-term Debt, Excluding Current Maturities |  |  |  |  |  | 0
Liabilities | 13,117,000 |  | 13,117,000 |  |  | 12,118,000
Revenues | 408,000 |  | 998,000 |  |  |
Cost of Revenue | 410,000 |  | 886,000 |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  | (2,748,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss |  |  |  |  |  | 0
Stockholders' Equity Attributable to Parent |  |  |  |  |  | (2,748,000)
Liabilities and Equity |  |  |  |  |  | $ 9,370,000
Net Income (Loss) Attributable to Parent | $ 30,000 |  | $ 128,000 |  |  |
Earnings Per Share, Basic and Diluted | $ 0.00 |  | $ (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 | $ 16,775,000 |  | $ 47,519,000 |  |  |
Sales Revenue, Services, Net | 27,150,000 |  | 80,489,000 |  |  |
Revenue, Net | 43,925,000 |  | 128,008,000 |  |  |
Cost of Goods Sold | 10,177,000 |  | 29,670,000 |  |  |
Cost of Services | 15,376,000 |  | 44,690,000 |  |  |
Research and Development Expense | 3,789,000 |  | 11,288,000 |  |  |
Selling and Marketing Expense | 8,412,000 |  | 25,888,000 |  |  |
General and Administrative Expense | 7,084,000 |  | 21,679,000 |  |  |
Costs and Expenses | 44,838,000 |  | 133,215,000 |  |  |
Operating Income (Loss) | (913,000) |  | (5,207,000) |  |  |
Net interest and other expense | (93,000) |  | (455,000) |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (1,006,000) |  | (5,662,000) |  |  |
Income tax expense | 138,000 |  | 620,000 |  |  |
Cash, Cash Equivalents, and Short-term Investments | 33,236,000 |  | 33,236,000 |  |  |
Accounts receivable, net of allowance for doubtful accounts of $2,786 and $2,852 as of September 30, 2018 and December 31, 2017, respectively | 28,971,000 |  | 28,971,000 |  |  |
Inventories | 24,676,000 |  | 24,676,000 |  |  |
Current contract assets | 0 |  | 0 |  |  |
Prepaid Expense and Other Assets | 3,741,000 |  | 3,741,000 |  |  |
Long-Lived Assets | 96,860,000 |  | 96,860,000 |  |  |
Other Assets, Noncurrent | 6,701,000 |  | 6,701,000 |  |  |
Non-current contract assets | 0 |  | 0 |  |  |
Non-current deferred income tax asset | 46,000 |  | 46,000 |  |  |
Assets | 194,231,000 |  | 194,231,000 |  |  |
Accounts Payable and Other Accrued Liabilities, Current | 58,342,000 |  | 58,342,000 |  |  |
Deferred Revenue, Current | 6,424,000 |  | 6,424,000 |  |  |
Contract liabilities | 0 |  | 0 |  |  |
Long-term contract liabilities | 0 |  | 0 |  |  |
Deferred Income Taxes and Other Liabilities, Noncurrent | 4,607,000 |  | 4,607,000 |  |  |
Long-term Debt, Excluding Current Maturities | 20,252,000 |  | 20,252,000 |  |  |
Liabilities | 89,625,000 |  | 89,625,000 |  |  |
Retained Earnings (Accumulated Deficit) | (10,699,000) |  | (10,699,000) |  |  |
Common stock, additional paid-in capital, and accumulated other comprehensive loss | 115,305,000 |  | 115,305,000 |  |  |
Stockholders' Equity Attributable to Parent | 104,606,000 |  | 104,606,000 |  |  |
Liabilities and Equity | 194,231,000 |  | 194,231,000 |  |  |
Net Income (Loss) Attributable to Parent | $ (1,144,000) |  | $ (6,282,000) |  |  |
Earnings Per Share, Basic and Diluted | $ (0.07) |  | $ (0.37) |  |  |
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities |  |  | $ 12,063,000 |  |  |
Increase (Decrease) in Accounts Receivable and Inventories |  |  | (3,124,000) |  |  |
Increase (Decrease) in Prepaid Expense and Other Assets |  |  | (961,000) |  |  |
Increase (Decrease) in Deferred Revenue |  |  | (297,000) |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities |  |  | 362,000 |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | $ 1,761,000 |  |  |

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