Summary of Significant Accounting Policies (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | ||||||||||||||||||||||||||||||||||||
Summary of Significant Accounting Policies | ||||||||||||||||||||||||||||||||||||
Estimated useful lives |
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Summary of award types and accounting policies |
†Stock options expire no later than 10 years after the grant date. ‡Expense is reversed if award is forfeited prior to vesting. |