Debt (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Line of Credit Facility [Line Items]
Total interest expense	$ 30,000	$ (16,000)	$ 60,000	$ 45,000
GE Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, aggregate amount	20,000,000		20,000,000
Term loan available upon request, aggregate amount	$ 25,000,000		$ 25,000,000
Revolving credit facility, expiration date			Sep. 26, 2019
Increase in applicable interest rate, per annum, if default occurs			2.00%
Revolving credit facility, aggregate interest rate	4.75%		4.75%		4.75%
Revolving credit facility, outstanding balance	$ 0		$ 0		$ 0
Revolving credit facility, remaining availability	20,000,000		20,000,000		$ 20,000,000
Minimum [Member] | GE Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, restriction on cash and cash equivalents	$ 5,000,000		5,000,000
Revolving credit facility, liquidity requirement after effect to stock repurchase			$ 20,000,000