XML 61 R49.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stockholders' Equity - Warrants - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2014
Nov. 30, 2014
Sep. 30, 2014
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2012
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Class Of Stock [Line Items]                        
Purchase shares of common stock for issued warrants                 21,347,182     2,909,750
Cash proceeds from warrant exercises         $ 139,000   $ 55,000          
Warrants to purchase common stock   145,000   1,370         650,000      
Interest expense       $ 0 $ 0   $ 1,000          
Warrants maturity term   5 years               5 years 5 years  
Warrants issued     50,000                  
Warrants earned, service period   17 months                    
Number of warrant shares vested upon satisfaction of specific performance metrics       95,000                
Volatility   73.40%   72.17% 73.96%   76.90%          
Risk-free interest rate   1.21%   1.16% 1.57%   1.60%          
Weighted-average remaining contractual term of options exercisable       5 years 10 months 21 days                
Consultation Service Agreement September 2014                        
Class Of Stock [Line Items]                        
Recognized expenses of warrants $ 237,000                      
Consultation Service Agreement November 2014                        
Class Of Stock [Line Items]                        
Recognized expenses of warrants         $ 6,000   $ 31,000          
Minimum [Member]                        
Class Of Stock [Line Items]                        
Warrants exercisable price, per share       $ 2.28                
Warrants maturity term                 2 years      
Maximum [Member]                        
Class Of Stock [Line Items]                        
Warrants exercisable price, per share       $ 7.62                
Warrants maturity term                 5 years      
Amendment March 2014 [Member]                        
Class Of Stock [Line Items]                        
Warrants exercisable price, per share               $ 1.00        
Warrants to purchase common stock               269,657        
Amendment March 2014 [Member] | Minimum [Member]                        
Class Of Stock [Line Items]                        
Warrants exercisable price, per share               $ 0.85        
Warrants [Member]                        
Class Of Stock [Line Items]                        
Number of warrants exercised       353,093 0   203,000          
Cash proceeds from warrant exercises       $ 336,000 $ 0   $ 445,000          
Number of warrant exercised through cashless       469,000 43,796   8,647          
Cashless exercise in exchange for issuance of common stock       347,286 32,914   7,600          
Warrants exercisable price, per share   $ 6.84                    
Estimated fair value of warrants   $ 74,000                    
Weighted-average remaining contractual term of options exercisable       1 year 10 months 10 days                
Warrants [Member] | Consultants [Member]                        
Class Of Stock [Line Items]                        
Number of warrants exercised       0 0 0            
Warrants [Member] | Minimum [Member]                        
Class Of Stock [Line Items]                        
Warrants exercisable price, per share                 $ 1.70      
Warrants [Member] | Maximum [Member]                        
Class Of Stock [Line Items]                        
Warrants exercisable price, per share                 $ 3.24      
Warrants [Member] | Amendment March 2014 [Member]                        
Class Of Stock [Line Items]                        
Interest expense               $ 12,000