Other current assets (Tables)

3 Months Ended

Mar. 31, 2015

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

Schedule of other current assets

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

	March 31 2015		December 31 2014
Prepaid expenses	$	1,544	$	1,827
Refundable research and development tax credits	809		809
Security deposits and other receivables	530		622
Interest receivables	283		96
	$	3,166	$	3,354