Fair value measurement (Tables)

9 Months Ended

Sep. 30, 2015

Fair value measurement

Schedule of financial assets and liabilities that are measured at fair value on a recurring basis

At September 30, 2015	Level 1		Level 2		Level 3		Total
Assets:
Money market accounts	$	2,230	$	—	$	—	$	2,230
Total assets	$	2,230	$	—	$	—	$	2,230

At December 31, 2014	Level 1		Level 2		Level 3		Total
Assets:
Money market accounts	$	5,602	$	—	$	—	$	5,602
Marketable securities	—		1,614		—		1,614
Total assets	$	5,602	$	1,614	$	—	$	7,216
Liabilities:
Contingent consideration	$	—	$	—	$	131	$	131
Total liabilities	$	—	$	—	$	131	$	131

Schedule of reconciliation of the beginning and ending amounts related to the fair value of contingent consideration for the Endeka acquisition, categorized as Level 3

Beginning balance, January 1, 2015	$	131
Change in fair value	(114		)
Payment of contingent consideration	(17		)
Balance, September 30, 2015	$	—