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Debt, Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 3 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Nov. 30, 2016
USD ($)
Tranche
$ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Loan and security agreement, payment term       Issuable in three separate tranches (the Term Loans), $10.0 million of which was funded in November 2016, $5.0 million of which was funded in June 2017 and $5.0 million of which was funded in December 2017.  
Operating lease, cost       $ 200,000 $ 200,000
Operating lease, weighted average remaining lease term       3 years 2 months 12 days  
Operating lease, weighted average discount rate       9.60%  
Silicon Valley Bank and Solar Capital, Ltd. [Member]          
Debt Instrument [Line Items]          
Available credit under loan and security agreement     $ 20,000,000    
Number of tranches | Tranche     3    
Term loan, principal outstanding before deducting debt issuance cost       $ 5,300,000  
Term loan, debt issuance costs       100,000  
Accretion Of Final Payment Of Debt Instrument       $ 1,800,000  
Warrants expiration year       7 years  
Aggregate fair value of warrants using black scholes option pricing model $ 500,000        
Silicon Valley Bank and Solar Capital, Ltd. [Member] | Term Loans Tranche One [Member]          
Debt Instrument [Line Items]          
Available credit under loan and security agreement     $ 10,000,000    
Loan and security agreement funded date     Nov. 30, 2016    
Exercise price of warrant per share | $ / shares     $ 43.93    
Silicon Valley Bank and Solar Capital, Ltd. [Member] | Term Loans Tranche One [Member] | Common Stock [Member]          
Debt Instrument [Line Items]          
Warrants to purchase number of common stock, shares | shares     3,415    
Silicon Valley Bank and Solar Capital, Ltd. [Member] | Term Loans Tranche Two [Member]          
Debt Instrument [Line Items]          
Available credit under loan and security agreement   $ 5,000,000      
Loan and security agreement funded date   Jun. 30, 2017      
Exercise price of warrant per share | $ / shares   $ 50.37      
Silicon Valley Bank and Solar Capital, Ltd. [Member] | Term Loans Tranche Two [Member] | Common Stock [Member]          
Debt Instrument [Line Items]          
Warrants to purchase number of common stock, shares | shares   1,489      
Silicon Valley Bank and Solar Capital, Ltd. [Member] | Term Loans Tranche Three [Member]          
Debt Instrument [Line Items]          
Available credit under loan and security agreement $ 5,000,000        
Loan and security agreement funded date Dec. 31, 2017        
Exercise price of warrant per share | $ / shares $ 51.98        
Silicon Valley Bank and Solar Capital, Ltd. [Member] | Term Loans Tranche Three [Member] | Common Stock [Member]          
Debt Instrument [Line Items]          
Warrants to purchase number of common stock, shares | shares 1,433        
Loan Amendment Agreement with SVB and Solar [Member]          
Debt Instrument [Line Items]          
Loan and security agreement, payment term       Under the Loan Agreement, we are obligated to make interest only payments through June 1, 2018, followed by consecutive equal monthly payments of principal and interest in arrears through the maturity date of November 18, 2020.  
Maturity date       Nov. 18, 2020  
Percentage of funded amounts for final payment     8.75%    
Loan Amendment Agreement with SVB and Solar [Member] | Prime Rate [Member]          
Debt Instrument [Line Items]          
Interest rate spread on variable rate     4.10%    
Loan Amendment Agreement with SVB and Solar [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Prepayment fee percentage     1.00%    
Loan Amendment Agreement with SVB and Solar [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Prepayment fee percentage     3.00%