Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity - Additional Information (Detail)

v3.20.2
Stockholder's Equity - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 17, 2020
shares
Jul. 16, 2020
shares
Apr. 10, 2020
USD ($)
TradingDay
$ / shares
shares
Sep. 30, 2016
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
$ / shares
shares
Sep. 14, 2018
shares
Schedule Of Capitalization Equity [Line Items]                    
Common stock, par value (in dollars per share) | $ / shares         $ 0.001   $ 0.001   $ 0.001  
Common stock, shares authorized (in shares)         100,000,000   100,000,000   100,000,000  
Common stock, shares issued (in shares)         10,478,927   10,478,927   9,741,372  
Common stock, shares outstanding (in shares)         10,478,927   10,478,927   9,741,372  
Common stock, reverse stock split             1-for-10      
Derivative liability fair value adjustment | $         $ 693 $ 1,324 $ 1,393 $ (2,101)    
Warrant liabilities fair value adjustment | $         (3,560) (2,049) (8,329) 4,473    
Warrant liabilities | $         10,100   10,100      
Number of warrants issued to purchase common stock (in shares)                   1,319,807
Warrants to purchase common stock associated with Loan Agreement                    
Schedule Of Capitalization Equity [Line Items]                    
Number of warrants issued to purchase common stock (in shares)       12,243            
Exercise price of warrants (in dollars per share) | $ / shares       $ 36.754            
Warrant expiration period       5 years            
Other (Income) Expense | Senior Convertible Note Purchase Agreement                    
Schedule Of Capitalization Equity [Line Items]                    
Derivative liability fair value adjustment | $         700 $ 1,300 $ 1,400 $ 2,100    
Aspire Capital | Common Stock Purchase Agreement                    
Schedule Of Capitalization Equity [Line Items]                    
Sale of common stock at sole discretion | $     $ 20,000              
Number of purchase aggregate shares of common stock     1,956,547              
Percentage of common stock outstanding     19.99%              
Number of shares committed     70,910              
Average purchase price of shares sold | $ / shares     $ 8.461              
Percentage of common stock owned     19.99%              
Sale of common stock maximum number of share sold per business day     25,000              
Stock purchase price average number of trading days lowest closing sales price out of consecutive trading days | TradingDay     3              
Stock purchase price number of consecutive trading days | TradingDay     10              
Increase in sale of common stock maximum number of share sold per business day     200,000              
Percentage of purchase price per share     97.00%              
Aspire Capital | Common Stock Purchase Agreement | Commitment Shares                    
Schedule Of Capitalization Equity [Line Items]                    
Common stock shares issued     70,910              
Aspire Capital | Common Stock Purchase Agreement | Commitment Shares | Other Expense                    
Schedule Of Capitalization Equity [Line Items]                    
Fair value of shares | $         $ 600          
Aspire Capital | Common Stock Purchase Agreement | Maximum                    
Schedule Of Capitalization Equity [Line Items]                    
Sale of common stock at sole discretion | $     $ 20,000              
Percentage of common stock outstanding     19.99%              
Stock purchase percentage on aggregate shares of common stock traded     30.00%              
Closing sale price of common stock | $ / shares     $ 0.25              
Subsequent Event                    
Schedule Of Capitalization Equity [Line Items]                    
Common stock, shares authorized (in shares) 100,000,000 250,000,000                
Common stock, shares issued (in shares) 10,508,302 105,083,291                
Common stock, shares outstanding (in shares) 10,508,302 105,083,291                
Common stock, reverse stock split ratio   0.1                
Number of fractional shares issued result of reverse stock split 0 0