Warrant Transaction Agreements - Amazon.com, Inc. Transaction Agreement (Details)
$ / shares in Units, $ in Thousands |
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3 Months Ended |
6 Months Ended |
12 Months Ended |
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Apr. 04, 2017
USD ($)
item
$ / shares
shares
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Jun. 30, 2018
USD ($)
shares
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Jun. 30, 2017
USD ($)
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Jun. 30, 2018
USD ($)
shares
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Jun. 30, 2017
USD ($)
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Dec. 31, 2017
USD ($)
shares
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Jul. 20, 2017
$ / shares
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| Class of Warrant or Right [Line Items] |
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| Warrant shares vested (in shares) | shares |
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5,819,652
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5,819,652
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5,819,652
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| Selling, general and administrative |
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$ 12,241
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$ 17,904
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$ 20,550
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$ 27,049
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| Exercise price of warrants (in dollars per share) | $ / shares |
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$ 2.1231
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| Provision for common stock warrants |
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$ 3,921
|
1,820
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$ 5,806
|
1,820
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| Warrants issued with the Amazon.com, Inc transaction agreement |
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| Class of Warrant or Right [Line Items] |
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| Shares of common stock that can be purchased from warrants issued (in shares) | shares |
55,286,696
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| Cash payments to be received under agreement |
$ 600,000
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| Warrant shares vested (in shares) | shares |
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13,094,217
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13,094,217
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13,094,217
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| Provision for common stock warrants |
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$ 3,600
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$ 1,800
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$ 5,300
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$ 1,800
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| Tranche one of warrants issued with the Amazon.com, Inc transaction agreement |
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| Class of Warrant or Right [Line Items] |
|
|
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|
|
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| Warrant shares vested (in shares) | shares |
5,819,652
|
|
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|
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| Selling, general and administrative |
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$ 6,700
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| Tranche two of warrants issued with the Amazon.com, Inc. Transaction Agreement |
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| Class of Warrant or Right [Line Items] |
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| Shares of common stock that can be purchased from warrants issued (in shares) | shares |
29,098,260
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|
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| Number of installments | item |
4
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|
|
|
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| Number of shares per installment | shares |
7,274,565
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|
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| Cash receipt per installment |
$ 50,000
|
|
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| Aggregate cash receipts for all installments |
$ 200,000
|
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| Exercise price of warrants (in dollars per share) | $ / shares |
$ 1.1893
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| Tranche three of warrants issued with the Amazon.com, Inc. Transaction Agreement |
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| Class of Warrant or Right [Line Items] |
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| Shares of common stock that can be purchased from warrants issued (in shares) | shares |
20,368,784
|
|
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|
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| Number of installments | item |
8
|
|
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| Number of shares per installment | shares |
2,546,098
|
|
|
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| Cash receipt per installment |
$ 50,000
|
|
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| Aggregate cash receipts for all installments |
$ 400,000
|
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| 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
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