Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Accrued Expenses and Other Current Liabilities
Payroll and related benefits	$ 24,886	$ 28,938
Warranty	6,546	5,411
Installation	2,112	2,861
Sales, use, and other taxes	1,633	1,776
Professional fees	2,480	2,752
Restructuring liability	718	1,428
Other	3,353	5,252
Total accrued liabilities	41,728	$ 48,418
Accrued Warranty
Balance as of the beginning of period	5,411
Warranties issued	5,316
Settlements made	(2,550)
Changes in estimate	(1,631)
Balance as of the end of period	$ 6,546
Warranty period of products purchased	1 year