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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Nov. 30, 2014
Income Taxes And Tax Related [Line Items]        
Income tax (benefit) expense $ 385,000us-gaap_IncomeTaxExpenseBenefit $ 14,000us-gaap_IncomeTaxExpenseBenefit    
Income tax (benefit) expense, current 382,000us-gaap_CurrentIncomeTaxExpenseBenefit 11,000us-gaap_CurrentIncomeTaxExpenseBenefit    
Income tax expense, deferred 3,000us-gaap_DeferredIncomeTaxExpenseBenefit 3,000us-gaap_DeferredIncomeTaxExpenseBenefit    
Net operating loss carryforwards, federal     116,216,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic  
Research and development tax credit forward     1,312,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch  
Net operating loss carryforwards       2,600,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Uncertain tax positions 0us-gaap_UnrecognizedTaxBenefits      
Interest or penalties on uncertain tax positions 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued      
Additional Paid-In Capital [Member]        
Income Taxes And Tax Related [Line Items]        
Net operating loss carryforwards     71,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Scenario, Previously Reported [Member]        
Income Taxes And Tax Related [Line Items]        
Net operating loss carryforwards     69,698,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Brazil [Member]        
Income Taxes And Tax Related [Line Items]        
Income tax (benefit) expense, current $ 355,000us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_BR		      
Research and Development [Member] | Scenario, Previously Reported [Member]        
Income Taxes And Tax Related [Line Items]        
Net operating loss carryforwards expiration date     2028  
Minimum [Member] | Brazil [Member]        
Income Taxes And Tax Related [Line Items]        
Foreign tax expense rate 15.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= country_BR		      
Maximum [Member] | Brazil [Member]        
Income Taxes And Tax Related [Line Items]        
Foreign tax expense rate 18.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= country_BR		      
United States [Member]        
Income Taxes And Tax Related [Line Items]        
Net operating loss carryforwards expiration date     2028  
State [Member] | Minimum [Member] | Scenario, Previously Reported [Member]        
Income Taxes And Tax Related [Line Items]        
Net operating loss carryforwards expiration date     2015  
State [Member] | Maximum [Member] | Scenario, Previously Reported [Member]        
Income Taxes And Tax Related [Line Items]        
Net operating loss carryforwards expiration date     2028