Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	$ 7,498,000		$ 7,449,000
Transfers from Level 1 to Level 2	0		0
Transfers from Level 2 to Level 1	0		0
Unrealized gains	26,000	$ 0
Level 1 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	6,801,000		6,778,000
Level 2 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	697,000		671,000
Level 3 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	0		0
Money Market Funds [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	6,801,000		6,778,000
Money Market Funds [Member] | Level 1 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	6,801,000		6,778,000
Money Market Funds [Member] | Level 2 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	0		0
Money Market Funds [Member] | Level 3 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	0		0
Common Shares of Co Two Solution [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	697,000		671,000
Common Shares of Co Two Solution [Member] | Level 1 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	0		0
Common Shares of Co Two Solution [Member] | Level 2 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	$ 697,000		671,000
Investment owned (shares)	10,000,000
Common Shares of Co Two Solution [Member] | Level 3 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Financial assets	$ 0		$ 0
Other Expense [Member]
Summary of financial instruments measured at fair value on a recurring basis
Unrealized gains	$ 26,000
Other Comprehensive Income (Loss) [Member]
Summary of financial instruments measured at fair value on a recurring basis
Unrealized gains		$ 100,000