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Employee Benefit Plans and Stock-based Compensation - Stock-based compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]      
Total stock-based compensation $ 1,096 $ 1,349 $ 1,129
Net effect on net income (loss) $ 1,096 $ 1,349 $ 1,129
Weighted Average Number of Shares Outstanding, Basic 32,139 32,183 32,452
Weighted Average Number of Shares Outstanding, Diluted 32,894 32,183 32,452
Effect on basic net income per share (in dollars per share) $ (0.03) $ (0.04) $ (0.03)
Effect on diluted net income per share (in dollars per share) $ (0.03) $ (0.04) $ (0.03)
Cost of Revenue [Member]      
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]      
Total stock-based compensation $ 23 $ 20 $ 18
Selling, General and Administrative [Member]      
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]      
Total stock-based compensation 908 1,148 938
Research and Development [Member]      
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]      
Total stock-based compensation $ 165 $ 181 $ 173