XML 26 R16.htm IDEA: XBRL DOCUMENT

Equipment and Improvements	9 Months Ended
Equipment and Improvements	Sep. 30, 2017
Property Plant And Equipment [Abstract]
Equipment and Improvements	8. Equipment and Improvements Equipment and improvements are stated at cost. Depreciation is computed using the straight-line method based on the estimated useful lives of the assets, generally ranging from three to seven years. Leasehold improvements are amortized using the straight-line method over the shorter of the estimated useful life of the asset or the lease term.