Income Taxes (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Significant components of the Company's deferred tax assets and liabilities
Valuation allowance	$ (49,500,000)	$ (37,100,000)
Section 382 recognized built in loss	8,000,000
Deferred tax assets included in other noncurrent assets	1,400,000
Deferred tax liabilities included in other current liabilities	1,400,000
U.S.
Significant components of the Company's deferred tax assets and liabilities
Intangible assets		59,000
Deferred revenue	4,492,000	3,425,000
Other reserves and accruals	1,492,000	1,253,000
Property, plant and equipment	1,624,000	1,450,000
Amortization of stock-based compensation	10,623,000	9,183,000
Capitalized research & development expenditures	12,816,000	13,775,000
Net operating loss carryforwards	18,857,000	9,883,000
Total deferred tax asset	49,904,000	39,028,000
Valuation allowance	(40,002,000)	(26,746,000)
Net deferred tax assets	9,902,000	12,282,000
Intangible assets	(335,000)
Non-employee stock based compensation	(1,556,000)	(1,556,000)
Section 382 recognized built in loss	(8,011,000)	(10,726,000)
Net deferred tax liability	(9,902,000)	(12,282,000)
Foreign
Significant components of the Company's deferred tax assets and liabilities
Intangible assets	1,269,000	999,000
Tax credit carryforwards	78,000	84,000
Property, plant and equipment	464,000	504,000
Capitalized research & development expenditures	4,777,000	5,195,000
Net operating loss carryforwards	2,931,000	3,556,000
Total deferred tax asset	9,519,000	10,338,000
Valuation allowance	$ (9,519,000)	$ (10,338,000)