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Revenue from Contracts with Customers (ASC 606) Financial Statement Impact of Adopting ASC 606 (Details) - USD ($) | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Financial Statement Impact of Adopting ASC 606 [Line Items] |  |  |
Cash, Cash Equivalents, and Short-term Investments | $ 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 |  | $ 28,316,000
Inventories | 22,912,000 |  | 22,732,000
Current contract assets | 3,419,000 |  | 0
Prepaid Expense and Other Assets | 3,339,000 |  | 3,816,000
Long-Lived Assets | 96,049,000 |  |
Other Assets, Noncurrent | 6,735,000 |  | 5,927,000
Non-current contract assets | 6,266,000 |  | 0
Non-current deferred income tax asset | 198,000 |  | 20,000
Assets | 203,627,000 |  | 196,239,000
Accounts Payable and Other Accrued Liabilities, Current | 38,403,000 |  |
Deferred Revenue, Current | 0 |  | 6,919,000
Contract liabilities | 11,051,000 |  | 0
Long-term contract liabilities | 8,374,000 |  | 0
Other Liabilities, Noncurrent | 2,213,000 |  | 19,000
Long-term Debt, Excluding Current Maturities | 38,575,000 |  | 44,572,000
Liabilities | 101,196,000 |  | 90,574,000
Retained Earnings (Accumulated Deficit) | (12,401,000) |  | (4,417,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss | 114,832,000 |  |
Stockholders' Equity Attributable to Parent | 102,431,000 |  | 105,665,000
Liabilities and Equity | 203,627,000 |  | 196,239,000
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] |  |  |
Cash, Cash Equivalents, and Short-term Investments | 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 |  | 28,316,000
Inventories | 22,912,000 |  | 22,732,000
Current contract assets | 0 |  | 0
Prepaid Expense and Other Assets | 3,339,000 |  | 3,816,000
Long-Lived Assets | 96,049,000 |  | 92,513,000
Other Assets, Noncurrent | 6,735,000 |  | 5,927,000
Non-current contract assets | 0 |  | 0
Non-current deferred income tax asset | 21,000 |  | 20,000
Assets | 193,765,000 |  | 196,239,000
Accounts Payable and Other Accrued Liabilities, Current | 38,403,000 |  | 36,430,000
Deferred Revenue, Current | 6,716,000 |  | 6,919,000
Contract liabilities | 0 |  | 0
Long-term contract liabilities | 0 |  | 0
Other Liabilities, Noncurrent |  |  | 2,653,000
Long-term Debt, Excluding Current Maturities | 38,575,000 |  | 44,572,000
Liabilities | 88,487,000 |  | 90,574,000
Retained Earnings (Accumulated Deficit) | (9,554,000) |  | (4,417,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss | 114,832,000 |  | 110,082,000
Stockholders' Equity Attributable to Parent | 105,278,000 |  | 105,665,000
Liabilities and Equity | 193,765,000 |  | 196,239,000
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 | 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
Other Liabilities, Noncurrent |  | 2,653,000 | 0
Long-term Debt, Excluding Current Maturities |  | 44,572,000 | 0
Liabilities | $ 12,709,000 | 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
Stockholders' Equity Attributable to Parent |  | 102,917,000 | (2,748,000)
Liabilities and Equity |  | $ 205,609,000 | 9,370,000
Deferred Revenue |  |  | 12,118,000
Contract with Customer, Asset, Net |  |  | 9,370,000
Sales Commission [Member] | 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] |  |  |
Retained Earnings (Accumulated Deficit) |  |  | 191,000
Deferred Tax Assets, Net |  |  | $ 203,000

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