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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Research costs - Nordic $ 0 $ 1,228
Research costs - other 10,057 8,404
Payroll and employee benefits 5,643 9,338
Professional fees 10,482 7,532
Other current liabilities 95 95
Total accrued expenses and other current liabilities $ 26,277 $ 26,597
Letter of Intent | Abaloparatide-SC Phase 3 Extension Clinical Study | Clinical Trial Services Agreement | Nordic    
Research Agreements    
Collaborative agreement term provided for standard care treatment 24 months