5. Debt

Capital Lease Arrangements

Since 2013, the Company has entered into capital lease arrangements with equipment manufacturers to finance acquisitions of computer equipment. These leases have effective annual interest rates ranging from 5.2% to 5.7%, and carry terms of 48 months. At the end of the lease periods, the Company has the option to purchase the underlying equipment at the estimated fair market value, or for a nominal amount in some cases. As of September 30, 2017 and December 31, 2016, the net book value of the equipment under these capital leases was $2,526 and $3,158, respectively, and the remaining principal balance payable was $2,803 and $3,411, respectively.

The maturities of all outstanding debt, consisting of the capital lease arrangements, as of September 30, 2017, are as follows:

Year ending
2017	$	359
2018		1,117
2019		928
2020		389
2021		10
		2,803
Less:
Current portion		(1,096	)
Non-current portion of debt	$	1,707

Revolving Credit Facility

In December 2016, the Company terminated its existing revolving credit facility with Silicon Valley Bank. No amounts were outstanding pursuant to the revolving credit facility at the date of termination.