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ASC 606 and Business and Credit Concentrations Financial Statement Impact of Adopting ASC 606 (Details) - USD ($)
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Cash, cash equivalent and marketable securities $ 41,100,000    
Accounts receivable, net 28,550,000   $ 28,316,000
Inventories 23,327,000   22,732,000
Contract assets 3,305,000   0
Prepaid expenses and other current assets 4,419,000   3,816,000
Long-lived assets 97,728,000    
Other non-current assets 6,437,000   5,927,000
Contract assets, long-term 6,272,000   0
Non-current deferred income tax asset 214,000   20,000
Total assets 211,352,000   196,239,000
Accounts payable, accrued expenses, and other current liabilities 37,400,000    
Deferred revenue, current 0   6,919,000
Contract liabilities 11,973,000   0
Long-term contract liabilities 8,301,000   0
Other long-term liabilities 5,143,000    
Long-term debt, excluding current portion 41,701,000   44,572,000
Total liabilities 104,518,000   90,574,000
Retained Earnings (Accumulated Deficit) (11,058,000)   (4,417,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss 117,892,000    
Total stockholders’ equity 106,834,000   105,665,000
Total liabilities and stockholders’ equity 211,352,000   196,239,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Cash, cash equivalent and marketable securities   $ 42,915,000 0
Accounts receivable, net   28,316,000 0
Inventories   22,732,000 0
Contract assets   3,205,000 3,205,000
Contract with Customer, Asset, Net, Current     9,370,000
Prepaid expenses and other current assets   3,816,000 0
Long-lived assets   92,513,000 0
Other non-current assets   5,927,000 0
Contract assets, long-term   5,963,000 5,963,000
Non-current deferred income tax asset   222,000 202,000
Total assets 9,770,000 205,609,000 9,370,000
Accounts payable, accrued expenses, and other current liabilities   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 portion   44,572,000 0
Total liabilities 12,526,000 102,692,000 12,118,000
Retained Earnings (Accumulated Deficit)   (7,165,000) (2,748,000)
Deferred Revenue     12,118,000
Common stock, additional paid-in capital, and accumulated other comprehensive loss   110,082,000 0
Total stockholders’ equity   102,917,000 (2,748,000)
Total liabilities and stockholders’ equity   $ 205,609,000 9,370,000
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Cash, cash equivalent and marketable securities 41,100,000   42,915,000
Accounts receivable, net 28,550,000   28,316,000
Inventories 23,327,000   22,732,000
Contract assets 0   0
Prepaid expenses and other current assets 4,419,000   3,816,000
Long-lived assets 97,728,000   92,513,000
Other non-current assets 6,437,000   5,927,000
Contract assets, long-term 0   0
Non-current deferred income tax asset 21,000   20,000
Total assets 201,582,000   196,239,000
Accounts payable, accrued expenses, and other current liabilities 37,400,000   36,430,000
Deferred revenue, current 7,748,000   6,919,000
Contract liabilities 0   0
Long-term contract liabilities 0   0
Other long-term liabilities 5,143,000    
Long-term debt, excluding current portion 41,701,000   44,572,000
Total liabilities 91,992,000   90,574,000
Retained Earnings (Accumulated Deficit) (8,302,000)   (4,417,000)
Common stock, additional paid-in capital, and accumulated other comprehensive loss 117,892,000   110,082,000
Total stockholders’ equity 109,590,000   105,665,000
Total liabilities and stockholders’ equity $ 201,582,000   196,239,000
Sales Commission [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Retained Earnings (Accumulated Deficit)     191,000
Deferred Tax Assets, Net     $ 203,000