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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