Certain Balance Sheet Components - (Details) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014
Prepaid expenses and other current assets:
Prepaid inventories to contract manufacturer (1)	[1]	$ 8,500		$ 0	[2]
Prepaid software license to Vislink (2)		0	[2]	1,233
Other prepayments		8,736		9,713
Deferred cost of revenue		4,601		2,524
Income tax receivable		1,770		2,316
Restricted cash (3)		1,093	[3]	0
Other		303		1,753
Prepaid Expense and Other Assets, Current		25,003		17,539
Inventories:
Raw materials		5,421		1,422
Work-in-process		1,950		1,255
Finished goods		31,448		30,070
Total inventories, net		38,819		32,747
Property and equipment:
Furniture and fixtures		7,808		7,691
Machinery and equipment		93,010		86,766
Capitalized software		29,391		29,265
Leasehold improvements		10,000		8,140
Property and equipment, gross		140,209		131,862
Less: accumulated depreciation and amortization		(113,197)		(104,641)
Property and equipment, net		27,012		27,221
Accrued liabilities:
Accrued compensation		4,688		6,655
Accrued incentive compensation		3,476		5,125
Accrued warranty		3,913		4,242
Other		19,277		19,096
Accrued liabilities, Total		31,354		35,118
Other Liabilities, Noncurrent:
Deferred rent, long-term		6,340		7,501
Deferred revenue, long-term		3,093		2,890
Other		294		320
Other Liabilities, Noncurrent		$ 9,727		$ 10,711

[1] From time to time, the Company makes advance payment to a supplier for future inventory in order to secure more favorable pricing. The Company anticipates that this amount will be offset in the first quarter of 2017 against the accounts payable owed to this supplier.

[2] The prepaid inventories were related to prepayment for software licenses made to Vislink (see Note 5, “Investments in Other Equity Securities” for additional information on Vislink).

[3] (3) The restricted cash balances are held as cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party.