Liabilities - Accrued Expenses and Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Accrued expenses and other current liabilities
Payroll and related benefits	$ 13,538	$ 18,780
Warranty	4,209	4,217
Professional fees	2,806	1,827
Installation	1,411	1,382
Sales, use, and other taxes	436	1,282
Restructuring liability	1,219	1,796
Interest	1,915
Other	2,946	3,917
Total	$ 28,480	$ 33,201
Accrued Warranty
Warranty period	1 year
Balance, beginning of the year	$ 4,217
Warranties issued	973
Consumption of reserves	(1,327)
Changes in estimate	346
Balance, end of the year	$ 4,209