Convertible Notes (Tables)

3 Months Ended

Mar. 31, 2017

Convertible Notes.

Schedule of convertible note interest expense

The following table presents total interest expense recognized related to the Convertible Notes during the three months ended March 31, 2016 and 2017 (in thousands):

	Three Months Ended March 31,
	2016		2017
Contractual interest expense	$	1,509	$	1,509
Amortization of debt discount		2,315		2,615
Amortization of debt issuance costs		157		143
Total interest expense	$	3,981	$	4,267