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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) |  |  |

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