Borrowings (Credit facility) (Details) (USD $)	12 Months Ended	3 Months Ended	13 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Apr. 30, 2012	Dec. 31, 2013
Line of Credit Facility [Line Items]
Required pledge of equity interests in subsidiary, percent	100.00%	100.00%
LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, variable rate	2.25%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving line of credit, maximum	10,000,000	$ 10,000,000
Unused commitment fee, percentage	0.25%
Borrowings under Revolving Line of Credit	9,900,000	9,900,000		0
Quarterly net loss target		1,000,000.0
Revolving Credit Facility [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, variable rate	3.00%
Debt instrument, interest rate at period end	3.30%	3.30%
Secured Debt [Member] | Equipment Term Loan [Member]
Line of Credit Facility [Line Items]
Eligible equipment purchase, percentage			80.00%
Debt instrument, amount borrowed			5,000,000
Long-term borrowings	559,000	$ 559,000
Debt instrument, term	36 months
Secured Debt [Member] | Equipment Term Loan [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, variable rate	2.25%
Debt instrument, interest rate at period end	2.50%	2.50%