Balance Sheet Components (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Inventories:
Raw materials	$ 14,322	$ 11,582
Work in process	7,800	1,653
Finished goods	47,175	33,359
Total inventories, net	69,297	46,594
Prepaid expenses
Prepaid commissions	13,176	9,240
Other prepaid expenses	15,470	10,346
Prepaid expenses	28,646	19,586
Property and equipment:
Equipment	64,384	43,533
Furniture and fixtures	6,517	5,897
Leasehold improvements	9,778	9,063
Software	35,607	30,693
Construction in progress	7,211	3,651
Property and equipment, gross	123,497	92,837
Accumulated depreciation and amortization	(81,486)	(60,528)
Total property and equipment, net	42,011	32,309	$ 36,178
Other long term assets:
Capitalized software, net	33,233	26,011
Other assets	1,818	1,883
Total other long term assets, net	35,051	27,894
Accrued liabilities:
Advance payments from customers	7,030	8,327
Rebates and lease buyouts	4,025	4,702
Group purchasing organization fees	3,737	2,983
Taxes payable	4,003	2,768
Other accrued liabilities	12,400	11,353
Total accrued liabilities	$ 31,195	$ 30,133