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Summary of Significant Accounting Policies - Summary of Impact of ASC 606 Adoption on Account Receivable (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Balance Sheets |  |
Accounts receivable | $ 6,536 | $ 2,991
ASU 2014-09 [Member] |  |
Balance Sheets |  |
Accounts receivable | 6,536 |
ASU 2014-09 [Member] | Balances Without the Adoption of ASC 606 [Member] |  |
Balance Sheets |  |
Accounts receivable | 3,546 |
ASU 2014-09 [Member] | Impact Adoption of ASC 606 [Member] |  |
Balance Sheets |  |
Accounts receivable | $ 2,990 |

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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