Revenue from Contracts with Customers - Summary of Changes in Deferred Revenue Balances for Product and Service Revenue (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Deferred Revenue Arrangement [Line Items]
Opening Balance - December 31, 2017	$ 6,141
Additions	526
Recognized into Revenue	(329)
Recognized into Accumulated Deficit	(5,703)
Ending Balance - March 31, 2018	635
Product [Member]
Deferred Revenue Arrangement [Line Items]
Opening Balance - December 31, 2017	5,888
Additions	191
Recognized into Revenue	(150)
Recognized into Accumulated Deficit	(5,703)
Ending Balance - March 31, 2018	226
Service [Member]
Deferred Revenue Arrangement [Line Items]
Opening Balance - December 31, 2017	253
Additions	335
Recognized into Revenue	(179)
Ending Balance - March 31, 2018	$ 409

Amount of the cumulative effect on retained earnings net of related income tax effect.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

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Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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