Organization and Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Recurring [Member]	Dec. 31, 2013 Recurring [Member]	Jun. 30, 2014 Level 1 [Member] Recurring [Member]	Dec. 31, 2013 Level 1 [Member] Recurring [Member]	Jun. 30, 2014 Level 2 [Member] Recurring [Member]	Dec. 31, 2013 Level 2 [Member] Recurring [Member]	Jun. 30, 2014 Level 3 [Member] Recurring [Member]	Dec. 31, 2013 Level 3 [Member] Recurring [Member]
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis [Abstract]
Money market funds included in cash and cash equivalents					$ 5,543,100	$ 1,842,000	$ 5,543,100	$ 1,842,000	$ 0	$ 0	$ 0	$ 0
Total					5,543,100	1,842,000	5,543,100	1,842,000	0	0	0	0
Finance Leases [Abstract]
Interest earned on finance lease	66,200	34,600	150,000	65,000
Impairment charge	$ 6,800,000	$ 0	$ 6,800,000	$ 0