Fair Value Measurements (Schedule of Financial Instruments Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Summary of financial instruments measured at fair value on a recurring basis
Total financial assets measured at fair value on a recurring basis	$ 12,241	$ 12,314
Cash, Cash Equivalents, and Short-term Investments	12,241	12,314
Transfers from Level 1 to Level 2	0
Transfers from Level 2 to Level 1	0
Level 1 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Cash, Cash Equivalents, and Short-term Investments	11,190	11,172
Level 2 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Cash, Cash Equivalents, and Short-term Investments	1,051	1,142
Level 3 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Cash, Cash Equivalents, and Short-term Investments	0	0
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	11,190	11,172
Summary of financial instruments measured at fair value on a recurring basis
Total financial assets measured at fair value on a recurring basis	11,190	11,172
Money Market Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	11,190	11,172
Money Market Funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Money Market Funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	0
Common Shares of Co Two Solution [Member]
Summary of financial instruments measured at fair value on a recurring basis
Total financial assets measured at fair value on a recurring basis	1,051	1,142
Common Shares of Co Two Solution [Member] | Level 1 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Total financial assets measured at fair value on a recurring basis	0	0
Common Shares of Co Two Solution [Member] | Level 2 [Member]
Summary of financial instruments measured at fair value on a recurring basis
Total financial assets measured at fair value on a recurring basis	$ 1,051	1,142
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
Total financial assets measured at fair value on a recurring basis	$ 0	$ 0