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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Liabilities
Warrants to purchase common stock	$ 5,208	$ 0
Recurring [Member]
Assets
Money market funds	14,497	28,774
Liabilities
Contingent consideration	492	948
Warrants to purchase common stock	5,208
Total liabilities	5,700
Fair Value Measured Using - (Level 1) [Member] | Recurring [Member]
Assets
Money market funds	14,497	28,774
Liabilities
Contingent consideration	0	0
Warrants to purchase common stock	0
Total liabilities	0
Fair Value Measured Using - (Level 2) [Member] | Recurring [Member]
Assets
Money market funds	0	0
Liabilities
Contingent consideration	0	0
Warrants to purchase common stock	0
Total liabilities	0
Fair Value Measured Using - (Level 3) [Member] | Recurring [Member]
Assets
Money market funds	0	0
Liabilities
Contingent consideration	492	$ 948
Warrants to purchase common stock	5,208
Total liabilities	$ 5,700

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Fair value of contingent consideration in a business combination that is classified in shareholders' equity.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Fair value of financial and nonfinancial obligations.

+ 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 (a)
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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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