Income Taxes Effective Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income Tax Reconciliation, Income Tax Benefit, at Federal Statutory Income Tax Rate									$ (4,615)	$ (5,390)	$ (5,050)
Income Tax Reconciliation, State and Local Income Taxes									(634)	(577)	17
U.S.-Foreign rate differential									480	100	342
Change in Valuation Allowance									3,072	4,115	5,862
Income Tax Reconciliation, Tax Credits, Research									175	357	(1,241)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount									1,566	1,560	406
Others									6	46	(25)
Total income tax expense	$ (14)	$ (10)	$ 61	$ 13	$ 97	$ 33	$ 106	$ (25)	$ 50	$ 211	$ 311