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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Total 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 in future periods and obligations not separately disclosed in the balance sheet (other liabilities).

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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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Deferred Revenue, Income and Remaining Performance Obligations (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2012
Disaggregation of Revenue [Line Items]
Current deferred revenue and income	$ 1,071	$ 1,071
Arizona Commerce Authority grant		0	$ 1,000
Current deferred revenue and income		217
Milestone payments received		1,000		$ 1,000
Revenues recognized included in contract liabilities balances	1,000	26
Revenue expected to be recognized from remaining performance obligations		$ 1,700
Contact period		The service contracts typically provide for four-year terms and revenue is recognized on a straight-line basis. The bundled lease agreements have between two and four year terms and revenue is recognized as product is shipped, typically in a straight-line pattern.
Products and services not yet delivered
Disaggregation of Revenue [Line Items]
Current deferred revenue and income	$ 71	$ 71
Current deferred revenue and income		$ 217