Quarterly report pursuant to Section 13 or 15(d)

Nature of Operations (Details)

v3.7.0.1
Nature of Operations (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accumulated deficit $ 246,158 $ 240,610
Number of product candidates approved for sale | item 0  
Total liabilities $ 14,899 $ 9,097