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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 9 Months Ended
Oct. 14, 2015
Oct. 18, 2012
Dec. 31, 2015
Dec. 15, 2015
Mar. 31, 2015
Mar. 28, 2014
Apr. 29, 2013
Stockholders Equity Note [Line Items]              
Common Stock, shares authorized     100,000,000   100,000,000    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 9.00            
Interest Rate of From Notice of Redemption 10.00%            
Error Corrections and Prior Period Adjustments, Description 9.00            
Preferred Stock, Redemption Amount $ 60,000,000            
Stock Issued During Period, Shares, Conversion of Convertible Securities 275,000            
Convertible Notes Payable [Member]              
Stockholders Equity Note [Line Items]              
Convertible notes, interest rate 8.00%         8.00%  
Warrant Liability [Member]              
Stockholders Equity Note [Line Items]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 200,000            
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 20.00            
Conversion Feature Liability And Warrant Liability [Member]              
Stockholders Equity Note [Line Items]              
Restricted shares granted to agent 325,000            
Stock Issued During Period, Shares, New Issues 325,000            
Conversion Feature Liability [Member]              
Stockholders Equity Note [Line Items]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 300,000            
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 10.00            
Southern California Heart Centers, A Medical Corporation [Member]              
Stockholders Equity Note [Line Items]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,111,111            
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 9.00            
Private Placement              
Stockholders Equity Note [Line Items]              
Restricted shares granted to agent 1,111,111            
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 9.00            
Stock Issued During Period, Value, New Issues $ 10,000,000            
Stock Issued During Period, Shares, New Issues 1,111,111            
Common Stock One [Member] | Estimate of Fair Value Measurement [Member]              
Stockholders Equity Note [Line Items]              
Restricted shares granted to agent 275,000            
Stock Issued During Period, Value, New Issues $ 1,402,500            
Stock Issued During Period, Shares, New Issues 275,000            
Fair Value Inputs, Discount for Lack of Marketability 15.00%            
Shares Issued, Price Per Share $ 5.10            
Common Stock Two [Member] | Estimate of Fair Value Measurement [Member]              
Stockholders Equity Note [Line Items]              
Restricted shares granted to agent 325,000            
Stock Issued During Period, Value, New Issues $ 1,657,500            
Stock Issued During Period, Shares, New Issues 325,000            
9% Notes Payable              
Stockholders Equity Note [Line Items]              
Convertible notes, interest rate     9.00%        
2010 Equity Incentive Plan              
Stockholders Equity Note [Line Items]              
Equity incentive plan, additional shares authorized for issuance   9,000,000          
Issuance of common stock for services (shares)     1,200,000        
2013 Equity Incentive Plan              
Stockholders Equity Note [Line Items]              
Equity incentive plan, shares authorized for issuance             500,000
2015 Equity Incentive Plan              
Stockholders Equity Note [Line Items]              
Equity incentive plan, shares authorized for issuance       1,500,000      
Equity incentive plan, shares available for future grant       1,500,000