Fair Value (Details) Unobservable (USD $) | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 |
In Thousands, unless otherwise specified |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Marketable Securities, Noncurrent | $944 | ' | ' | $832 | ' | ' | ' | ' |
Assets, Fair Value Disclosure | 51,444 | ' | ' | 3,832 | ' | ' | ' | ' |
Warrants and Rights Outstanding | 0 | 4,380 | 6,119 | 4,900 | 724 | 721 | 693 | 551 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | ' | ' | ' | 4,900 | ' | ' | ' | ' |
Fair Value, Inputs, Level 1 [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Assets, Fair Value Disclosure | 50,500 | ' | ' | 3,000 | ' | ' | ' | ' |
Warrants and Rights Outstanding | ' | ' | ' | 0 | ' | ' | ' | ' |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | ' | ' | ' | 0 | ' | ' | ' | ' |
Fair Value, Inputs, Level 2 [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Assets, Fair Value Disclosure | 944 | ' | ' | 832 | ' | ' | ' | ' |
Warrants and Rights Outstanding | ' | ' | ' | 0 | ' | ' | ' | ' |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | ' | ' | ' | 0 | ' | ' | ' | ' |
Fair Value, Inputs, Level 3 [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Assets, Fair Value Disclosure | 0 | ' | ' | 0 | ' | ' | ' | ' |
Warrants and Rights Outstanding | ' | ' | ' | 4,900 | ' | ' | ' | ' |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | ' | ' | ' | 4,900 | ' | ' | ' | ' |
Money Market Funds [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Cash and Cash Equivalents, Fair Value Disclosure | 50,500 | ' | ' | ' | ' | ' | ' | ' |
Restricted Cash and Cash Equivalents | ' | ' | ' | 3,000 | ' | ' | ' | ' |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Cash and Cash Equivalents, Fair Value Disclosure | 50,500 | ' | ' | ' | ' | ' | ' | ' |
Restricted Cash and Cash Equivalents | ' | ' | ' | 3,000 | ' | ' | ' | ' |
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | ' | ' | ' | ' | ' | ' | ' |
Restricted Cash and Cash Equivalents | ' | ' | ' | 0 | ' | ' | ' | ' |
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | ' | ' | ' | ' | ' | ' | ' |
Restricted Cash and Cash Equivalents | ' | ' | ' | 0 | ' | ' | ' | ' |
Municipal bond | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Marketable Securities, Noncurrent | 944 | ' | ' | 832 | ' | ' | ' | ' |
Municipal bond | Fair Value, Inputs, Level 1 [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Marketable Securities, Noncurrent | 0 | ' | ' | 0 | ' | ' | ' | ' |
Municipal bond | Fair Value, Inputs, Level 2 [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Marketable Securities, Noncurrent | 944 | ' | ' | 832 | ' | ' | ' | ' |
Municipal bond | Fair Value, Inputs, Level 3 [Member] | ' | ' | ' | ' | ' | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' |
Marketable Securities, Noncurrent | $0 | ' | ' | $0 | ' | ' | ' | ' |