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Balance Sheet Accounts (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]
Prepaid maintenance contracts (current)		$ 1,944	$ 2,026
Prepaid insurance		490	541
Prepaid rent		311	370
Other assets (current)		1,560	1,140
Prepaid expenses and other current assets	[1]	$ 4,305	$ 4,077
[1] As adjusted for the adoption of ASC 606 using the full retrospective method

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Prepaid Maintenance Contracts (Current)

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Amount of other miscellaneous assets expected to be realized or consumed within one year or operating cycle, if longer.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

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Amount of asset related to consideration paid in advance for rent that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

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