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Warrant Transaction Agreements - Amazon.com, Inc. Transaction Agreement (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 04, 2017
USD ($)
installment
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
shares
Jul. 20, 2017
$ / shares
Class of Warrant or Right [Line Items]                
Selling, general and administrative | $   $ 21,658 $ 13,627 $ 32,671 $ 22,951      
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) 55,286,696              
Warrant shares vested (in shares)   27,643,347   27,643,347     20,368,782  
Provision for common stock warrants | $   $ 3,400 $ 800 $ 4,700 $ 2,000      
Warrants issued with the Amazon.com, Inc transaction agreement | Maximum                
Class of Warrant or Right [Line Items]                
Cash payments to be received under agreement | $ $ 600,000              
Tranche one of warrants issued with the Amazon.com, Inc transaction agreement                
Class of Warrant or Right [Line Items]                
Warrant shares vested (in 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) 29,098,260              
Warrant shares vested (in shares) 29,098,260              
Number of installments | installment 4              
Number of shares per installment 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) 20,368,784              
Warrant shares vested (in shares) 20,368,784              
Number of installments | installment 8              
Number of shares per installment 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.