Annual report pursuant to Section 13 and 15(d)

Restructuring Charges (Summary of Activity) (Details)

v3.7.0.1
Restructuring Charges (Summary of Activity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]    
Balance at the beginning of the period $ 11 $ 1,185
Accrued 2,178
Adjustments (11) (78)
Paid (3,274)
Balance at the end of the period 11
Reduction in workforce (as a percentage) 20.00%  
Research And Development Expense [Member] | Contract Termination [Member]    
Restructuring Cost and Reserve [Line Items]    
Balance at the beginning of the period 1,185
Accrued
Adjustments (78)
Paid (1,107)
Balance at the end of the period
Research And Development Expense [Member] | Employee Severance [Member]    
Restructuring Cost and Reserve [Line Items]    
Balance at the beginning of the period
Accrued 1,167
Adjustments
Paid (1,167)
Balance at the end of the period
General And Administrative Expense [Member] | Employee Severance [Member]    
Restructuring Cost and Reserve [Line Items]    
Balance at the beginning of the period 11
Accrued 1,011
Adjustments (11)
Paid (1,000)
Balance at the end of the period $ 11