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Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Financial Instruments
Transfers between fair value measurement levels	$ 0		$ 0
Cash and Cash Equivalents
Cash and Cash Equivalents, at Carrying Value	23,818	$ 62,780	$ 24,303	$ 14,668
Available-for-Sale Securities:
Available-for-sale Securities	28,758
US Government-sponsored Securities
Available-for-Sale Securities:
Available-for-sale Securities	5,624
Corporate Debt Securities
Available-for-Sale Securities:
Available-for-sale Securities	23,134
Level 1
Assets:
Total assets	15,539	62,004
Level 1 | Money market funds
Cash and Cash Equivalents
Cash and Cash Equivalents, at Carrying Value	15,539	62,004
Level 2
Assets:
Total assets	35,909
Level 2 | US Government-sponsored Securities
Cash and Cash Equivalents
Cash and Cash Equivalents, at Carrying Value	7,151
Available-for-Sale Securities:
Available-for-sale Securities	5,624
Level 2 | Corporate Debt Securities
Available-for-Sale Securities:
Available-for-sale Securities	23,134
Recurring
Assets:
Total assets	51,448	62,004
Recurring | US Government-sponsored Securities
Cash and Cash Equivalents
Cash and Cash Equivalents, at Carrying Value	7,151
Available-for-Sale Securities:
Available-for-sale Securities	5,624
Recurring | Corporate Debt Securities
Available-for-Sale Securities:
Available-for-sale Securities	23,134
Recurring | Money market funds
Cash and Cash Equivalents
Cash and Cash Equivalents, at Carrying Value	$ 15,539	$ 62,004

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