Balance Sheet Details (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Inventory
Raw material and purchased parts	$ 16,723	$ 13,114
Work-in-process	2,374	1,753
Finished goods	23,149	17,511
Cost of inventory shipped	2,490	9,242
Total inventories	44,736	41,620
Property and equipment, net:
Property and equipment, gross	100,477	93,170
Less accumulated depreciation and amortization	(55,536)	(56,935)
Total property and equipment, net	44,941	36,235
Accounts payable and accrued liabilities:
Accounts payable	15,356	14,762
FCPA settlement	0	2,250
Customer dispute settlement accrual	85	890
Income tax payable	2,366	2,068
Other accrued liabilities	7,629	7,211
Total accounts payable and accrued liabilities	25,436	27,181
Accrued warranty:
Beginning balance	269	258
Product warranties issued	324	446
Settlement of warranties	(236)	(259)
Changes related to preexisting warranties	(178)	(179)
Foreign currency translation adjustment	1	3
Ending balance	180	269
Machinery, furniture and office equipment [Member]
Property and equipment, net:
Property and equipment, gross	63,528	62,593
Computer hardware and software [Member]
Property and equipment, net:
Property and equipment, gross	10,672	10,918
Leasehold improvements [Member]
Property and equipment, net:
Property and equipment, gross	10,576	10,376
Construction in progress [Member]
Property and equipment, net:
Property and equipment, gross	$ 15,701	$ 9,283