Summary of accounting policies.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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-Publisher FASB
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Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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Revenue Recognition - Additional Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2017
Summary Of Accounting Policies [Line Items]
Revenue	$ 19,469,000	$ 19,653,000	$ 18,848,000	$ 22,841,000	$ 26,797,000	$ 22,467,000	$ 22,738,000	$ 25,439,000	$ 80,811,000	$ 97,441,000
Topic 606 [Member]
Summary Of Accounting Policies [Line Items]
Cumulative-effect adjustment to retained earnings											$ 404,000
Asset impairment charges related to contract assets									0
Capitalized contract acquisition costs	$ 87,000								87,000		$ 292,000
Capitalized contract cost, amortization									168,000
Impairment loss in relation to costs capitalized									0
Topic 606 [Member] \| Impact of changes in accounting policies, Effect of Change Higher/(Lower) [Member]
Summary Of Accounting Policies [Line Items]
Revenue									$ 1,894,000