Fair Value Measurements (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Fair value measurements
Minimum net worth of financial institutions required for investment	$ 1,000,000,000
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level1 [Member]
Fair value measurements
Cash equivalents	10,400,000	10,400,000
Trade accounts receivable		25,000
Fair value of assets and liabilities	10,202,000	10,344,000
Fair Value Measurements Recurring [Member] | Fair Value Inputs Level1 [Member] | Key Employee Long Term Incentive Plan [Member]
Fair value measurements
Liabilities	198,000	81,000
Fair Value Measurements Recurring [Member] | Estimate Of Fair Value Fair Value Disclosure [Member]
Fair value measurements
Cash equivalents	10,400,000	10,400,000
Trade accounts receivable		25,000
Fair value of assets and liabilities	10,202,000	10,344,000
Fair Value Measurements Recurring [Member] | Estimate Of Fair Value Fair Value Disclosure [Member] | Key Employee Long Term Incentive Plan [Member]
Fair value measurements
Liabilities	$ 198,000	$ 81,000