Accounts receivable (Tables)

12 Months Ended

Dec. 31, 2015

Accounts receivable [Abstract]

Accounts receivable

Accounts receivable consist of the following:

	December 31,
(in thousands)	2015			2014
Billed		$	102,155		$	39,948
Unbilled			18,612			18,886
Total		$	120,767		$	58,834

For the year ended December 31, 2015, the Companyrecorded an allowance for doubtful accounts for a customer account of approximately $3.5 million within the Company's Biosciences segment. As of December 31, 2014, no allowance for doubtful accounts was recorded as the collection history from the Company's customers indicated that collection was probable.