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Income Taxes - Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
United States federal corporate income tax rate 34.00%    
(Decrease) increase in income taxes resulting from:      
Computed “expected” tax expense $ 906 $ 451 $ 2,339
State income tax expense, net of federal benefit (37) (31) 336
State research and development, investment credits (317) (365) (309)
Non-deductible meals & entertainment 33 37 31
Non-deductible stock compensation expense 181 29 178
Non-deductible transaction costs 260 87 0
Non-deductible transaction costs 0 73 170
Subpart F income, net of foreign tax credits 61 296 162
Manufacturing deduction (102) (123) 0
Nontaxable interest income (106) (105) (86)
Foreign tax rate differential (792) (289) (369)
Federal research and development credits (348) (453) (746)
Uncertain tax positions (413) 97 0
Change in tax rates 80 (317) 0
Change in tax rates (313) 235 0
Change in valuation allowance 1,392 1,665 491
Net income tax expense 413 1,284 2,150
Foreign Research and Development Incentives [Member]      
(Decrease) increase in income taxes resulting from:      
Other 59 0 0
Other Deductions [Member]      
(Decrease) increase in income taxes resulting from:      
Other $ (13) $ (3) $ (47)