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Debt (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Long-term debt maturities
2017		$ 368
2018		398
2019		428
Total		1,194
Less current portion		368	$ 340
Total (less current maturities)		826	1,193
Mortgage Payable
Long-term debt
Mortgage payable outstanding		$ 1,200	$ 1,500
Interest rate (as a percent)		7.91%	7.91%
Mortgage Payable \| Level 3
Long-term debt
Fair value of debt instrument		$ 1,200	$ 1,600
Mortgage Payable \| Land and Buildings
Long-term debt
Value of assets pledged to secure debt		$ 3,300	$ 3,300
Subsequent event \| 2.70 Convertible Senior Notes due 2023 \| Convertible debt
Long-term debt
Aggregate principal amount	$ 345,000
Interest rate (as a percent)	2.70%