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Fair Value Measurements - Summary of Issuances, Changes in Fair Value and Classifications of Level 3 Financial Instruments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Significant Unobservable Inputs (Level 3) [Line Items] |  |
Beginning Balance | $ 948 | $ 1,074
Warrants issued in conjunction with Private Placement and Subsequent Financing on April 14, 2016 and June 15, 2016, respectively, and Placement Agent Warrants | 4,958 |
Change in estimated fair value | (206) | (126)
Ending Balance | 5,700 | 948
Significant Unobservable Inputs (Level 3), Contingent Consideration Liability [Member] |  |
Significant Unobservable Inputs (Level 3) [Line Items] |  |
Beginning Balance | 948 | 1,074
Warrants issued in conjunction with Private Placement and Subsequent Financing on April 14, 2016 and June 15, 2016, respectively, and Placement Agent Warrants | 0 |
Change in estimated fair value | (456) | (126)
Ending Balance | 492 | 948
Significant Unobservable Inputs (Level 3), Warrants To Purchase Common Stock [Member] |  |
Significant Unobservable Inputs (Level 3) [Line Items] |  |
Beginning Balance | 0 | 0
Warrants issued in conjunction with Private Placement and Subsequent Financing on April 14, 2016 and June 15, 2016, respectively, and Placement Agent Warrants | 4,958 |
Change in estimated fair value | 250 | 0
Ending Balance | $ 5,208 | $ 0

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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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