Other current assets (Tables)

6 Months Ended

Jun. 30, 2015

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of other current assets

Other current assets consisted of the following (in thousands):

	June 30 2015		December 31 2014
Prepaid expenses	$	1,203	$	1,827
Refundable research and development tax credits	—		809
Security deposits and other receivables	634		622
Interest receivables	179		96
	$	2,016	$	3,354