Long-term debt: (Tables)

12 Months Ended

Dec. 31, 2016

Long-term debt:

Schedule of interest expense recognized and the effective interest rates for the Convertible Notes

        The amount of interest expense recognized and effective interest rate for the Convertible Notes were as follows (in thousands):

	Year Ended December 31, 2014
Contractual coupon interest	$	419
Amortization of discount and costs		3,106
Interest expense	$	3,525
Effective interest rate		8.7	%

Schedule of aggregate future contractual maturities of long-term debt

        The aggregate future contractual maturities of long-term debt, including the IPA discussed in Note 2, were as follows as of December 31, 2016 (in thousands):

For the year ending December 31,
2017	$	2,792
2018		2,729
2019		—
2020		—
2021		189,225
Thereafter		375,000
Total	$	569,746