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Stockholder's Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 14 Months Ended 1 Months Ended
Nov. 30, 2014
Apr. 30, 2011
Mar. 31, 2015
Mar. 31, 2015
Feb. 28, 2014
Dec. 31, 2014
Class of Warrant or Right [Line Items]            
Common stock, shares issued 30,941,102us-gaap_StockIssuedDuringPeriodSharesNewIssues     20,720,986us-gaap_StockIssuedDuringPeriodSharesNewIssues    
Additional shares of common available for outstanding exercisable prefunded warrants 13,081,428mstx_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsIssuedToUnderwriter          
Warrants issued to purchase shares of common stock. 22,011,265us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights          
Securities offered and sold combination     These securities were offered and sold to the underwriters and the public in units with each Series A unit consisting of one share of our common stock and one-half (0.5) of a warrant and each Series B unit consisting of one pre-funded warrant and one-half (0.5) of a warrant.      
Gross proceeds of financing $ 21,000,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity     $ 15,400,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity    
Proceeds from exercise of warrants 16,500,000us-gaap_ProceedsFromWarrantExercises          
Net proceeds from financing 19,700,000mstx_ProceedsFromIssuanceOfCommonStockAndWarrantsNet     14,600,000mstx_ProceedsFromIssuanceOfCommonStockAndWarrantsNet    
Exercise price of warrants per share $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1          
Warrants exercisable period Nov. 12, 2019          
Weighted average sale price       $ 0.74mstx_WeightedAverageSalesPrice    
Common stock, shares issued     159,476,176us-gaap_CommonStockSharesIssued 159,476,176us-gaap_CommonStockSharesIssued   159,458,376us-gaap_CommonStockSharesIssued
Purchase price per share pursuant to the exercise of a repurchase right under the merger agreement   $ 0.001us-gaap_TreasuryStockAcquiredAverageCostPerShare        
First Milestone - FDA Acceptance [Member]            
Class of Warrant or Right [Line Items]            
Common stock shares to be issued upon achieving milestones   3,839,400us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= mstx_FirstMilestoneSharesMember		        
Second Milestone - FDA Approval [Member]            
Class of Warrant or Right [Line Items]            
Common stock shares to be issued upon achieving milestones   8,638,650us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= mstx_SecondMilestoneSharesMember		        
Synthrx [Member]            
Class of Warrant or Right [Line Items]            
Common stock, shares issued   3,050,851us-gaap_CommonStockSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= mstx_SynthrxMember		        
Repurchase of common stock   1,454,079us-gaap_TreasuryStockSharesAcquired
/ us-gaap_BusinessAcquisitionAxis
= mstx_SynthrxMember		        
Common stock shares to be issued upon achieving milestones   12,478,050us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_BusinessAcquisitionAxis
= mstx_SynthrxMember		        
Maximum [Member]            
Class of Warrant or Right [Line Items]            
Amount available to sell under equity program         30,000,000mstx_AmountAvailableToSellUnderEquityProgram
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Pre-funded Warrants [Member]            
Class of Warrant or Right [Line Items]            
Proceeds from exercise of warrants $ 100,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_StatementEquityComponentsAxis
= mstx_PreFundedWarrantsMember		          
Exercise price of warrants per share $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= mstx_PreFundedWarrantsMember		          
Series A [Member]            
Class of Warrant or Right [Line Items]            
Common stock, shares issued 30,941,102us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= us-gaap_SeriesAMember		          
Number of common stock called by each warrant 0.5us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= us-gaap_SeriesAMember		          
Series A [Member] | Common Stock [Member]            
Class of Warrant or Right [Line Items]            
Number of securities in each unit issued 1mstx_NumberOfSecuritiesInEachUnit
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= us-gaap_SeriesAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		          
Series B [Member]            
Class of Warrant or Right [Line Items]            
Additional shares of common available for outstanding exercisable prefunded warrants 13,081,428mstx_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsIssuedToUnderwriter
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= us-gaap_SeriesBMember		          
Number of common stock called by each warrant 0.5us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= us-gaap_SeriesBMember		          
Series B [Member] | Pre-funded Warrants [Member]            
Class of Warrant or Right [Line Items]            
Number of securities in each unit issued 1mstx_NumberOfSecuritiesInEachUnit
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= us-gaap_SeriesBMember
/ us-gaap_StatementEquityComponentsAxis
= mstx_PreFundedWarrantsMember