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Share-Based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, par value (in dollars per share)   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Stock Options | Stock Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price for all stock options granted under the Plan (in dollars per share)   $ 10.00arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= arct_StockOptionPlanMember
 
Number of shares authorized (in shares)   500,000.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= arct_StockOptionPlanMember
 
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum authorized amount as a percentage of shares authorized 5.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Maximum percent of awards as a percent of total outstanding 10.00%arct_MaximumPercentofAwardsasaPercentofTotalOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Restricted Stock | Restricted Share Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 7,500,000.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= arct_RestrictedSharePlanMember
   
Shares automatically granted (in shares)   3,000arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAutomaticGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= arct_RestrictedSharePlanMember
 
Vesting percentage   20.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodicVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= arct_RestrictedSharePlanMember
 
Vesting period   4 years  
Share-based payment award, award vesting rights   25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= arct_RestrictedSharePlanMember
 
Granted (in shares)   281,517us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= arct_RestrictedSharePlanMember
 
Equity-based compensation $ 16,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= arct_RestrictedSharePlanMember
$ 19,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= arct_RestrictedSharePlanMember
 
Compensation cost not yet recognized   $ 3,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= arct_RestrictedSharePlanMember
 
Shares expected to vest   3 years 8 months 12 days  
Advisor | Restricted Stock | Restricted Share Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)   279,679us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= arct_RestrictedSharePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arct_AdvisorMember