Consolidated Balance Sheets [Parenthetical] - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Allowance for accounts receivable (in dollars)	$ 35	$ 127
Common stock, par value (in euro per share)	$ 0.122	$ 0.122
Common stock, shares authorized	53,198	53,198
Common stock, shares issued	41,241	40,191
Common stock, shares outstanding	41,241	40,191