Convertible Notes (Tables)

3 Months Ended

Mar. 31, 2016

Convertible Notes.

Schedule of convertible note interest expense

The following table sets forth total interest expense recognized related to the Convertible Notes during the three months ended March 31, 2015 and 2016 (in thousands):

	Three Months Ended March 31,
	2015		2016
Contractual interest expense	$	1,526	$	1,509
Amortization of debt discount		2,026		2,315
Amortization of debt issuance costs		174		157
Total interest expense	$	3,726	$	3,981