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Balance Sheet Components (Short-Term Line of Credit) (Narrative) (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Dec. 04, 2013
Dec. 14, 2012
Balance Sheet Related Disclosures [Abstract]        
Maximum borrowing capacity       $ 10,000,000
Line of credit facility, component of calculation for maximum borrowing amount under formula advances       $ 1,000,000
Line of credit facility maximum borrowing capacity limited by eligible AR       80.00%
Line of credit facility, maximum borrowing capacity under non-formula advances     $ 10,000,000  
Line of credit facility, amount outstanding $ 3,000,000 $ 3,000,000    
Short-term debt, weighted average interest rate 3.50% 3.50%