Property and equipment consisted of the following as of December 31, 2017 and 2016:

Depreciation expense from continuing operations was approximately $0.4 million and $0.5 million for the years ended December 31, 2017 and 2016, respectively. There was no internal-use software amortization expense included in depreciation and amortization expense for either period. As of December 31, 2017, capitalized external-use software was fully amortized.

The decrease in gross property and equipment and accumulated depreciation in 2017 was the result of the expiration of the lease on the Company’s former office space in Parsippany, NJ and the removal of the assets associated with those buildings as well as the removal of old IT equipment. The Company disposed of various property and equipment with a total cost of $5.0 million and a net book value of five thousand dollars at disposition. Accordingly, it recognized a loss of five thousand on the disposition.