ValveXchange Investment (Details) (USD $) Share data in Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Jul. 31, 2011	Sep. 30, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Preferred stock carrying value		$ 5,908,000	$ 5,908,000
ValveXchange, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Equity ownership percent		19.00%
Loans receivable, revolving credit line, maximum capacity	2,000,000
Loans receivable, revolving credit line, expiration date	Jul. 30, 2018
Loans receivable, revolving credit line, interest rate	8.00%
Loan origination costs net of fees	117,000
Amount of loan advanced		2,000,000	2,000,000
ValveXchange, Inc. [Member] | Series A Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Preferred stock purchased, value	3,500,000
Cost Method Investments, Original Cost	3,500,000
Preferred stock purchased, shares		2.4	2.4
Preferred stock carrying value		$ 3,200,000	$ 3,200,000