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Debt - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2017
Oct. 17, 2016
Mar. 01, 2015
Debt Instrument [Line Items]            
Deferred financing costs   $ 125,000 $ 197,000      
Amortization of financing costs   $ 72,000 87,000      
Comerica Term Loan            
Debt Instrument [Line Items]            
Quarterly principal payments, excess cash flow, percent   50.00%        
Term Loan            
Debt Instrument [Line Items]            
Stated interest rate percentage   12.00%        
Promissory Note | SRS Note            
Debt Instrument [Line Items]            
Stated interest rate percentage           15.00%
Debt instrument, covenant, cash balance repayment threshold   200.00%        
Note payable, face value   $ 1,785,000        
Interest payable, current and noncurrent   565,000        
Promissory Note | SRS Note | Scenario, Forecast            
Debt Instrument [Line Items]            
Interest payable, current and noncurrent       $ 752,000    
Promissory Note | SRS Note | Principal payment terms, period 1            
Debt Instrument [Line Items]            
Debt instrument, periodic payment, principal   $ 50,000        
Debt instrument, additional periodic payment, principal, earnings benchmark, measurement period   3 months        
Debt covenant, additional principal payments, adjusted base EBITDA   $ 1,500,000        
Promissory Note | SRS Note | Principal payment terms, period 2            
Debt Instrument [Line Items]            
Debt instrument, additional periodic payment, principal, earnings benchmark, measurement period   6 months        
Debt covenant, additional principal payments, adjusted base EBITDA   $ 3,000,000        
Debt covenant, additional principal payments, adjusted base EBITDA, percent   40.00%        
Main Street Capital Corporation | Term Loan            
Debt Instrument [Line Items]            
Revolving loan facility, maximum borrowing capacity   $ 11,000,000        
Senior Notes   9,000,000        
Total of periodic principal payments   0 0      
Main Street Capital Corporation | Main Street Revolver            
Debt Instrument [Line Items]            
Revolving loan facility, maximum borrowing capacity   2,000,000     $ 2,000,000  
Revolving loan facility, maximum borrowing capacity, not available during default   2,000,000        
Total of periodic principal payments   400,000        
Proceeds from revolving credit facility   $ 0 $ 613,000      
Debt instrument, principal payment, excess cash flow $ 244,000