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Summary of Significant Accounting Policies - Additional Disclosures (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014
Summary of Significant Accounting Policies |  |  |  |
Number of shares repurchased | 29,559 | 0 |  |
Cost of shares repurchased | $ 587,000 |  |  |
Decrease in total current assets |  | $ 1,100,000 |  |
Decrease in total current liabilities |  | 1,100,000 |  |
Research and Development |  |  |  |
Research and development expense | $ 1,400,000 | 1,200,000 | $ 1,200,000 |
Accounting Standards Update 2015-17 | Adjustments for New Accounting Principle, Early Adoption |  |  |  |
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model |  |  |  |
Decrease in current deferred taxes (asset) |  | 1,100,000 |  |
Decrease in current deferred taxes (liability) |  | 1,100,000 |  |
Minimum |  |  |  |
Intangible Assets |  |  |  |
Estimated useful lives of intangible assets with a definite life | 5 years |  |  |
Maximum |  |  |  |
Intangible Assets |  |  |  |
Estimated useful lives of intangible assets with a definite life | 14 years |  |  |
Options |  |  |  |
Share-Based Compensation |  |  |  |
Share-based compensation expense | $ 282,000 | $ 354,000 | $ 214,000 |
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model |  |  |  |
Expected term | 5 years |  |  |
Weighted-average grant-date fair value | $ 6.04 | $ 7.24 | $ 5.84 |
Total income tax benefit recognized | $ 312,000 | $ 320,000 | $ 280,000 |
Options | Minimum |  |  |  |
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model |  |  |  |
Expected volatility (as a percent) | 31.50% | 32.80% | 34.00% |
Risk free interest rate (as a percent) | 1.00% | 0.70% | 0.40% |
Exercise price (in dollars per share) | $ 19.97 | $ 22.55 | $ 18.85 |
Expected term |  | 3 years 9 months 18 days | 3 years 3 months 18 days |
Options | Maximum |  |  |  |
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model |  |  |  |
Expected volatility (as a percent) | 32.30% | 37.90% | 50.00% |
Risk free interest rate (as a percent) | 1.20% | 0.90% | 0.70% |
Exercise price (in dollars per share) | $ 22.36 | $ 25.48 | $ 21.67 |
Expected term |  | 5 years | 5 years |
Selling, general, and administrative expenses |  |  |  |
Share-Based Compensation |  |  |  |
Share-based compensation expense | $ 1,069,000 | $ 1,119,000 | $ 924,000 |
Component Products |  |  |  |
Goodwill |  |  |  |
Amount of excess of fair value over carrying value of the reporting unit |  |  |  | $ 69,000,000
Percentage of excess of fair value over carrying value of the reporting unit |  |  |  | 74.00%

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