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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 ($)
Jun. 30, 2016
USD ($)
Apr. 03, 2016
USD ($)
Feb. 10, 2016
USD ($)
Jan. 03, 2016
USD ($)
Line of Credit Facility [Line Items]                  
Revolving debt outstanding             $ 3,000,000   $ 2,000,000
Revolving Line of Credit | Bank                  
Line of Credit Facility [Line Items]                  
Revolving line of credit (up to) $ 6,000,000                
Amount of increase in company in company election (up to) $ 12,000,000                
Revolving debt outstanding             $ 3,000,000    
Interest rate             3.44%    
Tangible net worth               $ 12,000,000.0  
Percentage of proceeds from equity issuance               0.5  
Percentage of proceeds from investments 0.5                
Unrestricted cash or cash equivalents (at least) $ 6,000,000.0                
Long-term portion of obligations (at least) 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 $ 10,000,000.0      
Long-term portion of obligations (at least)   1.25 1.50