Related Party Transactions

6 Months Ended

Jun. 30, 2017

13. Related Party Transactions

The Company’s largest stockholder, Avista Capital Partners, L.P. and its affiliates (“Avista”), has an ownership interest in certain of the Company’s vendors. Related party expenses consisted of the following:


		Three Months Ended				Six Months Ended
		June 30,				June 30,
(in thousands)	Transaction Type	2017		2016		2017		2016
Avista	Offering costs paid on behalf of Avista pursuant to registration rights agreement	$	177	$	—	$	326	$	—
INC Research Holdings, Inc. (“INC”)*	Pharmacovigilance services		—		332		—		456
VWR Scientific	Inventory supplies		89		86		297		189

Total related party expenses		$	266	$	418	$	623	$	645

During the year ended December 31, 2016, Avista’s relationship with INC changed and Avista was no longer considered a principal owner of that Company. Related party expenses included in this table represent expenses incurred during the period under which the Company and INC were under common ownership by Avista.

Amounts billed and unbilled for related parties included in accounts payable and accrued expenses are immaterial at both June 30, 2017 and December 31, 2016.