Fair Value - Change in Fair Value for All Assets and Liabilities Using Unobservable Level 3 Inputs As Determined By Level 3 Inputs (Detail) - Fair Value Measurement at Reporting Date (Level 3) [Member] $ in Thousands	9 Months Ended
Sep. 30, 2017 USD ($)
Common Stock Warrants [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Issuance of warrants, net of financing costs	$ 8,715
Exercise of warrants	(2,772)
Change in fair value	25,213
Long-term portion	31,156
Ending balance	31,156
Contingent Consideration [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	22,800
Issuance of common stock in exchange for contingent consideration	(5,227)
Payment of contingent consideration	(395)
Change in fair value	1,226
Current portion	6,958
Long-term portion	11,446
Ending balance	$ 18,404

Fair Value - Change in Fair Value for All Assets and Liabilities Using Unobservable Level 3 Inputs As Determined By Level 3 Inputs (Detail) - Fair Value Measurement at Reporting Date (Level 3) [Member]
$ in Thousands

9 Months Ended

Sep. 30, 2017

USD ($)

Common Stock Warrants [Member]

Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]

Issuance of warrants, net of financing costs

$ 8,715

(2,772)

25,213

31,156

31,156

Contingent Consideration [Member]

Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]

Beginning balance

22,800

Issuance of common stock in exchange for contingent consideration

(5,227)

Payment of contingent consideration

(395)

1,226

6,958

11,446

$ 18,404

Fair value measurement with unobservable inputs recurring basis liability contingent consideration current.

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No definition available.

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- Definition

Fair value measurement with unobservable inputs recurring basis liability contingent consideration non current.

+ References

No definition available.

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- Definition

Fair value measurement with unobservable inputs recurring basis liability issuance of common stock in exchange for contingent consideration.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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.

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Amount of increase (decrease) 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.

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Amount of settlements 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.

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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.

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- Definition

Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258

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