COMMITMENTS AND CONTINGENCIES - Narrative (Details) CAD in Millions			1 Months Ended		12 Months Ended				144 Months Ended
	Jan. 07, 2016 USD ($)	May. 31, 2007 USD ($)	May. 31, 2012 USD ($)	Apr. 30, 2012 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Apr. 30, 2013 violation	Dec. 31, 2015 CAD	Dec. 31, 2015 CAD
Loss Contingencies [Line Items]
General length of product warranty					12 months
Rent expense					$ 3,700,000	$ 4,100,000	$ 3,900,000
Operating leases, future minimum payments, at end of lease term					13,329,000
Restricted cash					$ 1,811,000	1,993,000
Suspended payment period for remaining civil penalty								1 year
Vortek Industries
Loss Contingencies [Line Items]
Royalty guarantees payments, percentage of net sales from certain Flash RTP products					1.40%					1.40%
Vortek Industries | Royalty agreements
Loss Contingencies [Line Items]
Potential cash payment to Canadian Minister of Industries from certain Flash RTP products in connection with acquisition of Vortek Industries, Ltd.					$ 10,300,000					CAD 14.3
Cumulative royalty charges to date | CAD									CAD 0.6
Financial standby letter of credit
Loss Contingencies [Line Items]
Maximum potential amount required to pay under outstanding standby letters of credit					1,700,000
Regulatory violations
Loss Contingencies [Line Items]
Civil penalty				$ 900,000
Payment for civil penalty			$ 300,000
Remaining civil penalty contingency			$ 600,000
Number of violations | violation								0
Exton, Pennsylvania and Vancouver, Canada
Loss Contingencies [Line Items]
Sublease revenue					$ 200,000	$ 200,000	$ 400,000
Fremont, California
Loss Contingencies [Line Items]
Term of contract		10 years
Operating lease initial base rent cost		$ 1,400,000
Annual rent increase percentage		3.50%
Operating leases, future minimum payments, at end of lease term		$ 1,500,000
Fremont, California | Financial standby letter of credit
Loss Contingencies [Line Items]
Standby letter of credit		$ 1,500,000
Fremont, California | Subsequent Event
Loss Contingencies [Line Items]
Operating lease initial base rent cost	$ 1,600,000
Annual rent increase percentage	3.00%