Vendor Financing - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Line Of Credit Facility [Line Items]
Subordinated note outstanding	$ 2,500,000	$ 2,500,000
Minimum
Line Of Credit Facility [Line Items]
Subordinated note outstanding	2,500,000
Supplies Distributors | Minimum
Line Of Credit Facility [Line Items]
Subordinated note outstanding	2,500,000
Short Term Credit Facility | United States | IBM Credit LLC | Supplies Distributors
Line Of Credit Facility [Line Items]
Maximum financing receivable capacity through agreement thereafter	$ 13,000,000
Notice period time to exit from the agreement	The agreement has no stated maturity date and provides either party the ability to exit the facility following a 90-day notice.
Outstanding borrowing	$ 5,700,000	$ 8,400,000
Available credit	$ 3,100,000
Interest rate on outstanding borrowings	3.75%
Short Term Credit Facility | United States | IBM Credit LLC | Supplies Distributors | Minimum
Line Of Credit Facility [Line Items]
Subordinated note outstanding	$ 2,500,000
Short Term Credit Facility | United States | IBM Credit LLC | Supplies Distributors | Prime Rate
Line Of Credit Facility [Line Items]
Percentage points added to the reference rate to compute the variable rate on the debt instrument	0.50%