Balance Sheet Details (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011
Inventory
Raw material and purchased parts	$ 13,114	$ 9,661
Work-in-process	1,753	3,942
Finished goods	17,511	14,133
Consigned finished goods	9,242	5,498
Total inventories	41,620	33,234	43,802	41,039	39,180	29,662	29,030	26,465
Property and equipment, net:
Property and equipment, gross	93,170	77,934
Less accumulated depreciation and amortization	(56,935)	(49,393)
Total property and equipment, net	36,235	28,541	35,806	33,275	31,922	26,985	24,952	22,257
Accounts payable and accrued liabilities:
Accounts payable	14,762	15,196
FCPA settlement	2,250	5,425
Derivative suit settlement accrual	0	3,000
Customer dispute settlement accrual	890	2,333
Income tax payable	2,068	2,362
Other accrued liabilities	7,211	7,784
Total accounts payable and accrued liabilities	27,181	36,100	31,989	31,245	34,254	30,971	30,628	28,851
Accrued warranty:
Beginning balance	258	449
Product warranties issued	446	343
Settlement of warranties	(259)	(188)
Changes related to preexisting warranties	(179)	(354)
Foreign currency translation adjustment	3	8
Ending balance	269	258
Machinery, furniture and office equipment [Member]
Property and equipment, net:
Property and equipment, gross	62,593	53,356
Computer hardware and software [Member]
Property and equipment, net:
Property and equipment, gross	10,918	9,524
Leasehold improvements [Member]
Property and equipment, net:
Property and equipment, gross	10,376	8,253
Construction in progress [Member]
Property and equipment, net:
Property and equipment, gross	$ 9,283	$ 6,801