v2.4.1.9

Fair Value Measurements - Summary of Issuances, Changes in Fair Value and Reclassifications of Level 3 Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	$ 525us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	$ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Issuance of financial instruments	2,552us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
Change in estimated fair value	(1,464)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease	525us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Reclassification to stockholders' equity	(539)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInstrumentsClassifiedInShareholdersEquityPeriodIncreaseDecrease
Ending Balance	1,074us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	525us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Significant Unobservable Inputs (Level 3), Warrants to Purchase Convertible Preferred Stock [Member]
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	525us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_MandatorilyRedeemablePreferredStockMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_MandatorilyRedeemablePreferredStockMember
Issuance of financial instruments	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues / us-gaap_FairValueByLiabilityClassAxis = us-gaap_MandatorilyRedeemablePreferredStockMember
Change in estimated fair value	14us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = us-gaap_MandatorilyRedeemablePreferredStockMember	525us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = us-gaap_MandatorilyRedeemablePreferredStockMember
Reclassification to stockholders' equity	(539)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInstrumentsClassifiedInShareholdersEquityPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = us-gaap_MandatorilyRedeemablePreferredStockMember
Ending Balance	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_MandatorilyRedeemablePreferredStockMember	525us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_MandatorilyRedeemablePreferredStockMember
Significant Unobservable Inputs (Level 3), Derivative Liability Related to Subordinated Convertible Note [Member]
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Issuance of financial instruments	239us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Change in estimated fair value	(239)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Ending Balance	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Significant Unobservable Inputs (Level 3), Contingent Consideration Liability [Member]
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_ShareholdersEquityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_ShareholdersEquityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember
Issuance of financial instruments	2,313us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues / us-gaap_ShareholdersEquityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember
Change in estimated fair value	(1,239)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_ShareholdersEquityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_ShareholdersEquityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember
Reclassification to stockholders' equity	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInstrumentsClassifiedInShareholdersEquityPeriodIncreaseDecrease / us-gaap_ShareholdersEquityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember
Ending Balance	$ 1,074us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_ShareholdersEquityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember	$ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_ShareholdersEquityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember

X

- Details

Name:	us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) of financial instrument classified in shareholders' equity 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=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInstrumentsClassifiedInShareholdersEquityPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- 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=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

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.

+ 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=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- 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=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_MandatorilyRedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareholdersEquityClassAxis=us-gaap_ContingentConsiderationClassifiedAsEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: