Fair value warrants issued per share basis

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- Definition

Warrants vested

+ References

No definition available.

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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- Definition

Number of warrants or rights outstanding.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

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Significant Customers (Details) - USD ($) shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 08, 2016
Concentration Risk [Line Items]
Accounts receivable	$ 147,755,000				$ 109,114,000				$ 147,755,000	$ 109,114,000
Fair value warrants issued	13.76				14.24				13.76	14.24
Fair Value Adjustment of Warrants	(21,400,000)	$ 17,900,000	$ 11,700,000	$ (900,000)	20,400,000	$ (34,400,000)	$ (67,600,000)	$ 1,900,000	$ 7,400,000	$ (81,800,000)
DHL [Member] \| Revenues from Leases and Contracted Services [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues									26.00%	24.00%	34.00%
DHL [Member] \| Revenue from customers excluding revenue from reimbursed expenses [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues										30.00%	37.00%
DHL [Member] \| Accounts Receivable [Member]
Concentration Risk [Line Items]
Accounts receivable	13,400,000				15,700,000				$ 13,400,000	$ 15,700,000
Amazon [Member] \| Revenues from Leases and Contracted Services [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues									27.00%	44.00%	29.00%
Amazon [Member] \| Revenue from customers excluding revenue from reimbursed expenses [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues										27.00%	18.00%
Amazon [Member] \| Accounts Receivable [Member]
Concentration Risk [Line Items]
Accounts receivable	29,200,000				44,200,000				$ 29,200,000	$ 44,200,000
US Military [Member] \| Revenue from customers excluding revenue from reimbursed expenses [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues										10.00%	14.00%
US Military [Member] \| Revenues from Services Performed [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues									15.00%	7.00%	12.00%
US Military [Member] \| Accounts Receivable [Member]
Concentration Risk [Line Items]
Accounts receivable	50,500,000				$ 6,700,000				$ 50,500,000	$ 6,700,000
Amazon Warrant [Member]
Concentration Risk [Line Items]
Fair value warrants issued	$ 0								$ 0			$ 0
Class of Warrant or Right, Outstanding	14,830								14,830			7,690
Warrants vested									5,120