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Obligations - Revolving Line of Credit (Details)
3 Months Ended
Sep. 25, 2015
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 03, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jan. 03, 2016
USD ($)
Line of Credit Facility [Line Items]                
Revolving debt outstanding           $ 4,000,000   $ 2,000,000
Revolving line of credit | Bank                
Line of Credit Facility [Line Items]                
Revolving line of credit $ 6,000,000              
Amount of increase in company in company election 12,000,000              
Revolving debt outstanding           $ 4,000,000    
Interest           3.44%    
Tangible net worth $ 12,000,000.0           $ 10,000,000.0  
Percentage of proceeds from equity issuance 0.5              
Percentage of proceeds from investments 0.5              
Unrestricted cash or cash equivalents $ 6,000,000.0              
Ratio of quick assets to quick liabilities 2.00              
Revolving line of credit | Bank | Scenario, forecast                
Line of Credit Facility [Line Items]                
Tangible net worth   $ 4,000,000.0 $ 8,000,000.0 $ 8,000,000.0 $ 6,000,000.0      
Ratio of quick assets to quick liabilities   1.25 1.50