Balance Sheet Details (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Inventory
Raw material and purchased parts	$ 21,126,000	$ 23,042,000
Work-in-process	4,367,000	2,522,000
Finished goods	16,913,000	23,127,000
Consigned finished goods	28,000	184,000
Reserves	(3,379,000)	(4,019,000)
Total inventories, net	39,055,000	44,856,000
Property and equipment, net:
Property and equipment, gross	107,722,000	103,702,000
Less accumulated depreciation and amortization	(75,398,000)	(64,479,000)
Total property and equipment, net	32,324,000	39,223,000
Accounts payable and accrued liabilities:
Accounts payable	22,291,000	12,544,000
Income tax payable	1,376,000	1,852,000
Accrued warranty	1,288,000	716,000
Other accrued liabilities	9,030,000	11,899,000
Total accounts payable and accrued liabilities	33,985,000	27,011,000
Machinery, furniture and office equipment [Member]
Property and equipment, net:
Property and equipment, gross	76,077,000	72,323,000
Computer hardware and software [Member]
Property and equipment, net:
Property and equipment, gross	12,235,000	12,003,000
Leasehold improvements [Member]
Property and equipment, net:
Property and equipment, gross	16,883,000	16,661,000
Construction in progress [Member]
Property and equipment, net:
Property and equipment, gross	$ 2,527,000	$ 2,715,000