Organization and Summary of significant accounting policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segments	Jun. 30, 2013	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Business Segments			2
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ (43,124)	$ (38,175)	$ (85,442)	$ (77,080)
Net loss			6,484	5,427
Cost of sales	(28,342)	(24,803)	(57,409)	(50,681)
Gross profit	(14,782)	(13,372)	(28,033)	(26,399)
Provision for income taxes	(681)	(115)	(932)	(421)
Inventories	28,485		28,485		22,981
Deferred revenue			3,230	973
Deferred income taxes	1,144		1,144		1,219
Accumulated deficit	1,214,821		1,214,821		1,208,337
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	2,000
Net loss	100		100
Cost of sales	1,800
Gross profit	200
Provision for income taxes	100
Inventories	1,900		1,900
Deferred revenue	2,000
Deferred income taxes	100		100
Accumulated deficit	$ 100		$ 100