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Summary of significant accounting policies (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2013
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| Summary of significant accounting policies [Abstract] | |||||||||||||||||||||||||||||||||||||||||||
| Estimated useful lives of property, plant and equipment | Property, plant and equipment are stated at cost. Depreciation is computed using the straight-line method over the following estimated useful lives:
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| Assumptions used in valuing stock options granted | The Company determines the fair value of restricted stock units using the closing market price of the Company's common stock on the day prior to the date of grant. The Company utilizes the Black-Scholes valuation model for estimating the fair value of all stock options granted. The fair value of each option is estimated on the date of grant. Set forth below are the assumptions used in valuing the stock options granted and a discussion of the Company's methodology for developing each of the assumptions used:
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