Annual report pursuant to Section 13 and 15(d)

Derivative Instruments - Additional Information (Detail)

v2.4.1.9
Derivative Instruments - Additional Information (Detail) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Aug. 31, 2014
Jun. 30, 2013
Oct. 31, 2009
Derivative Instruments and Hedging Activities Disclosure [Abstract]            
Number of shares of common stock called by warrants   33,333us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 301,778us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 162,539us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 301,778us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 27,839us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Derivative warrant liability     $ 19,932us-gaap_DerivativeLiabilitiesCurrent      
Addition to Additional-Paid in Capital 48,380us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued          
Changes in fair value of derivative warrant liability $ 28,448us-gaap_FairValueAdjustmentOfWarrants $ 28,448us-gaap_FairValueAdjustmentOfWarrants $ (1,978)us-gaap_FairValueAdjustmentOfWarrants