Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Liabilities:
Contingent acquisition debt, current	$ 264	$ 2,765
Contingent acquisition debt, noncurrent	7,174	7,707
Warrant derivative liability	4,716	3,712
Total liabilities	$ 12,154	$ 14,184
Level 1 [Member]
Liabilities:
Contingent acquisition debt, current
Contingent acquisition debt, noncurrent
Warrant derivative liability
Total liabilities
Level 2 [Member]
Liabilities:
Contingent acquisition debt, current
Contingent acquisition debt, noncurrent
Warrant derivative liability
Total liabilities
Level 3 [Member]
Liabilities:
Contingent acquisition debt, current	$ 264	$ 2,765
Contingent acquisition debt, noncurrent	7,174	7,707
Warrant derivative liability	4,716	3,712
Total liabilities	$ 12,154	$ 14,184