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Shareholders' Equity - Summary of Change in Shareholders' Equity (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Shareholders Equity - Summary Of Change In Shareholders Equity Details      
Balance at the beginning of the period   $ 77,449 $ 82,569
Exercise of stock options   9 293
Stock repurchased $ 10,000 (928) (404)
Options repurchased   (1,752)
Proceeds from stock purchase plan   19 25
Dividends   (439) (459)
Share-based compensation   171 148
Tax benefit - stock option exercises   563
Unrealized gain or loss on investments, net of tax   38 121
Foreign currency translation adjustment   12 33
Net income/(loss) during the period   (468) 1,368
Balance at end of the period $ 75,863 $ 75,863 $ 82,505