Deferred Revenue, Income and Remaining Performance Obligations (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
Jan. 31, 2018	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Deferred revenue and income		$ 202	$ 202	$ 1,071
Arizona Commerce Authority grant		0	0	1,000
Revenues recognized included in contract liabilities balances	$ 1,000	30	65
Revenue expected to be recognized from remaining performance obligations		1,400	$ 1,400
Contact period			These contracts typically provide for four-year terms and revenue is recognized on a straight-line basis over the contract term.
Products and services not yet delivered
Disaggregation of Revenue [Line Items]
Deferred revenue and income		$ 202	$ 202	$ 71

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Carrying amount as of the balance sheet date of unearned revenue or income, not otherwise specified in the taxonomy, which is expected to be taken into income during the current period and current obligations not separately disclosed in the balance sheet (other liabilities, current).

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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.

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Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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