v2.4.1.9
Summary of significant accounting policies (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Significant Accounting Policies [Line Items]    
Foreign Currency Transaction Gain (Loss), before Tax $ 3,361us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 602us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Weighted Average Number of Shares Outstanding, Diluted 28,114,251us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 24,242,315us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net Cash Provided by (Used in) Operating Activities, Continuing Operations, Total 5,339us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (11,381)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net Cash Provided by (Used in) Financing Activities, Continuing Operations, Total 488us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 30,218us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Scenario, Previously Reported [Member]    
Significant Accounting Policies [Line Items]    
Net Cash Provided by (Used in) Operating Activities, Continuing Operations, Total   11,138us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Net Cash Provided by (Used in) Financing Activities, Continuing Operations, Total   7,699us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Restatement Adjustment [Member]    
Significant Accounting Policies [Line Items]    
Net Cash Provided by (Used in) Operating Activities, Continuing Operations, Total   $ 22,519us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember