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Restructuring - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Jun. 30, 2017
employee
Mar. 31, 2017
USD ($)
employee
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Restructuring Cost and Reserve [Line Items]                
Restructuring and related cost, number of positions eliminated | employee   17 20          
Restructuring $ (200,000)     $ 0 $ 1,534,000 $ 0    
Restructuring and related cost, obligations to be satisfied, term         12 months      
Restructuring and related Cost, estimate of sublease payments to be received         $ 1,300,000      
Lease obligations 1,800,000       1,800,000      
Additional restructuring charges expected 100,000       100,000      
Cash and cash equivalents 11,935,000     19,587,000 11,935,000 19,587,000 $ 16,629,000 $ 34,640,000
Debt obligations $ 0       0      
Impact of restructuring activities on operating expenses, excluding restructuring and asset impairment charges       $ (3,100,000)   $ (6,700,000)    
Restructuring Initiative 2017                
Restructuring Cost and Reserve [Line Items]                
Restructuring initiative, reduction of annual operating costs, amount     $ 10,000,000          
Severance and Related Benefits                
Restructuring Cost and Reserve [Line Items]                
Restructuring         700,000      
Facilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring         600,000      
Other                
Restructuring Cost and Reserve [Line Items]                
Restructuring         186,000      
Minimum                
Restructuring Cost and Reserve [Line Items]                
Impact of restructuring activities on operating expenses, excluding restructuring and asset impairment charges         8,000,000      
Maximum                
Restructuring Cost and Reserve [Line Items]                
Impact of restructuring activities on operating expenses, excluding restructuring and asset impairment charges         $ 9,000,000