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Debt (Details)
1 Months Ended 12 Months Ended 20 Months Ended
Dec. 28, 2015
USD ($)
Jul. 11, 2014
USD ($)
tranche
Lender
May. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
USD ($)
Jun. 25, 2012
USD ($)
installment
May. 09, 2011
USD ($)
Debt Instrument [Line Items]                    
Proceeds from issuance of note payable, net       $ 10,000,000 $ 19,714,000          
Repayments of Notes Payable       309,000 4,037,000 $ 848,000        
Interest Expense       2,000,000 741,000 410,000        
Non-cash interest       354,000 112,000 $ 44,000        
Note Agreement 1                    
Debt Instrument [Line Items]                    
Number of lenders | Lender   2                
Maximum borrowings available   $ 30,000,000                
Number of tranches | tranche   2                
Remaining borrowing capacity       10,000,000            
Proceeds from issuance of note payable, net       $ 29,700,000            
Interest rate including both the variable rate and the basis spread (as a percent)       7.28%            
Final fee as a percentage of original principal amount of amounts borrowed   4.75%                
Minimum amount of denomination for prepayment of borrowings   $ 1,000,000                
Effective interest rate including final fee interest and non-cash interest (as a percent)       9.70%            
Note Agreement 1 | Prior to second anniversary and after first anniversary of borrowing date                    
Debt Instrument [Line Items]                    
Prepayment premium (as a percent)   1.00%                
Note Agreement 1 | Prior to maturity date and after second anniversary of borrowing date                    
Debt Instrument [Line Items]                    
Prepayment premium (as a percent)   0.50%                
Note Agreement 1 | LIBOR                    
Debt Instrument [Line Items]                    
Variable Interest Rate   one-month LIBOR                
Basis spread (as a percent)   7.05%                
Note Agreement 1 | Tranche A                    
Debt Instrument [Line Items]                    
Maximum borrowings available   $ 20,000,000                
Minimum amount of draw upon closing   10,000,000                
Minimum amount of draw after closing   5,000,000                
Proceeds from issuance of debt         $ 20,000,000          
Note Agreement 1 | Tranche B                    
Debt Instrument [Line Items]                    
Maximum borrowings available   10,000,000 $ 10,000,000              
Commitment fee on undrawn principal (as a percent)     1.00%              
Fee Amount $ 50,000                  
Note Agreement 2                    
Debt Instrument [Line Items]                    
Maximum borrowings available                 $ 4,500,000  
Proceeds received on borrowings             $ 4,500,000      
Stated interest rate (as a percent)                 6.25%  
Number of monthly principal installments | installment                 36  
Repayments of Notes Payable   $ 2,900,000                
Note Agreement 2 | Prior to first anniversary of borrowing date                    
Debt Instrument [Line Items]                    
Prepayment premium (as a percent)                 2.00%  
Note Agreement 2 | Prior to second anniversary and after first anniversary of borrowing date                    
Debt Instrument [Line Items]                    
Prepayment premium (as a percent)                 1.00%  
Note Agreement 3                    
Debt Instrument [Line Items]                    
Maximum borrowings available                   $ 1,700,000
Proceeds received on borrowings               $ 1,400,000    
Stated interest rate (as a percent)                   6.50%
Minimum cash balance                   $ 300,000