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Summary of Significant Accounting Policies - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 28, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jul. 20, 2020
$ / shares
Apr. 06, 2020
$ / shares
shares
Dec. 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
Summary of Significant Accounting Policies Details [Line Items]                  
Reverse stock split, conversion ratio 0.10                
Derivative liability $ 6,300 $ 5,600   $ 5,600          
Pre-reverse stock split shares (in shares) | shares             538,995    
Exercise price (dollars per share) | $ / shares             $ 0.01    
Revenue, net   36,717 $ 39,322 59,883 $ 66,736        
Assets   190,275   190,275       $ 206,905  
Subsequent Event                  
Summary of Significant Accounting Policies Details [Line Items]                  
Exercise price (dollars per share) | $ / shares           $ 0.01      
Convertible Note 2019                  
Summary of Significant Accounting Policies Details [Line Items]                  
Restricted cash                 $ 2,700
Domestic                  
Summary of Significant Accounting Policies Details [Line Items]                  
Revenue, net   9,500 13,400 15,100 23,100        
Assets   145,600 138,400 145,600 138,400        
Foreign                  
Summary of Significant Accounting Policies Details [Line Items]                  
Revenue, net   4,100 4,900 5,900 8,400        
Assets   $ 44,700 $ 56,700 $ 44,700 $ 56,700        
Sales Revenue                  
Summary of Significant Accounting Policies Details [Line Items]                  
Concentration risk   27.00% 53.00% 30.00% 50.00%        
Sales Revenue | Customer One                  
Summary of Significant Accounting Policies Details [Line Items]                  
Concentration risk     22.00% 19.00% 25.00%        
Sales Revenue | Customer Two                  
Summary of Significant Accounting Policies Details [Line Items]                  
Concentration risk     31.00% 11.00% 25.00%        
Accounts Receivable                  
Summary of Significant Accounting Policies Details [Line Items]                  
Concentration risk       45.00% 64.00%        
(Level 2) | Estimate of Fair Value Measurement | Series B Senior Unsecured Convertible Notes                  
Summary of Significant Accounting Policies Details [Line Items]                  
Debt instrument, fair value disclosure   $ 24,700   $ 24,700          
(Level 2) | Estimate of Fair Value Measurement | 2023 Term Loans                  
Summary of Significant Accounting Policies Details [Line Items]                  
Debt instrument, fair value disclosure   26,300   26,300          
(Level 2) | Reported Value Measurement | Series B Senior Unsecured Convertible Notes                  
Summary of Significant Accounting Policies Details [Line Items]                  
Debt instrument, fair value disclosure   24,400   24,400          
(Level 2) | Reported Value Measurement | 2023 Term Loans                  
Summary of Significant Accounting Policies Details [Line Items]                  
Debt instrument, fair value disclosure   $ 54,700   $ 54,700