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Warrant Transaction Agreements - Amazon.com, Inc. Transaction Agreement (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 04, 2017
USD ($)
item
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
shares
Jul. 20, 2017
$ / shares
Class of Warrant or Right [Line Items]                
Selling, general and administrative   $ 10,400 $ 8,652 $ 33,351 $ 29,202      
Exercise price of warrants (in dollars per share) | $ / shares               $ 2.1231
Warrants issued with the Amazon.com, Inc transaction agreement                
Class of Warrant or Right [Line Items]                
Shares of common stock that can be purchased from warrants issued (in shares) | shares 55,286,696              
Cash payments to be received under agreement $ 600,000              
Warrant shares vested (in shares) | shares   20,368,782   20,368,782     20,368,782  
Exercise price of warrants (in dollars per share) | $ / shares   $ 0   $ 0        
Provision for common stock warrants   $ 2,400 $ 1,800 $ 4,400 $ 7,100      
Tranche one of warrants issued with the Amazon.com, Inc transaction agreement                
Class of Warrant or Right [Line Items]                
Warrant shares vested (in shares) | shares 5,819,652              
Selling, general and administrative           $ 6,700    
Tranche two of warrants issued with the Amazon.com, Inc. Transaction Agreement                
Class of Warrant or Right [Line Items]                
Shares of common stock that can be purchased from warrants issued (in shares) | shares 29,098,260              
Number of installments | item 4              
Number of shares per installment | shares 7,274,565              
Cash receipt per installment $ 50,000              
Aggregate cash receipts for all installments $ 200,000              
Exercise price of warrants (in dollars per share) | $ / shares $ 1.1893              
Tranche three of warrants issued with the Amazon.com, Inc. Transaction Agreement                
Class of Warrant or Right [Line Items]                
Shares of common stock that can be purchased from warrants issued (in shares) | shares 20,368,784              
Number of installments | item 8              
Number of shares per installment | shares 2,546,098              
Cash receipt per installment $ 50,000              
Aggregate cash receipts for all installments $ 400,000              
Exercise price calculation The exercise price of the third tranche of Amazon Warrant Shares will be an amount per share equal to ninety percent (90%) of the 30-day volume weighted average share price of the common stock as of the final vesting date of the second tranche of Amazon Warrant Shares