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Restructuring - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
employee
Mar. 31, 2017
USD ($)
employee
Dec. 31, 2016
USD ($)
Sep. 30, 2017
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Restructuring Cost and Reserve [Line Items]                            
Net loss $ (3,000) $ (1,920) $ (1,801) $ (2,390) $ (1,858) $ (1,773) $ (3,114) $ (4,522)     $ (9,111) $ (11,267) $ (16,887)  
Net cash (used in) provided by continuing operations                     (4,426) (5,868) (17,999)  
Cash and cash equivalents 6,335       10,761       $ 16,629   6,335 10,761 16,629 $ 34,640
Number of positions eliminated | employee             17 20            
Restructuring charges                       1,786    
Decrease in operating expense                     3,600 8,400    
Restructuring costs and asset impairment charges                       1,800    
Restructuring                     111 1,662 0  
Loss on impairment                 $ 900   0 185 $ 857  
Obligations to be satisfied, term                   12 months        
Estimate of sublease payments to be received                     700      
Operating lease, liability 1,100                   1,100      
Borrowings 2,219       $ 0           2,219 0    
Severance and Related Benefits                            
Restructuring Cost and Reserve [Line Items]                            
Restructuring charges                       770    
Restructuring                       800    
Facilities                            
Restructuring Cost and Reserve [Line Items]                            
Restructuring charges                       830    
Restructuring                     100 700    
Other                            
Restructuring Cost and Reserve [Line Items]                            
Restructuring charges                       186    
Restructuring                       $ 100    
Revolving Credit Facility                            
Restructuring Cost and Reserve [Line Items]                            
Borrowings $ 2,200                   $ 2,200