Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.19.2
Stockholders' Equity - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 02, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2013
Jul. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation   $ 1,200,000 $ 900,000 $ 2,100,000 $ 1,900,000    
Lender Warrants [Member] | Series B convertible preferred stock [Member] | Term Loan One [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Warrant issued           111,112  
Exercise price of warrant per share           $ 0.90  
Warrant expiration date           Jul. 03, 2023  
Common Stock [Member] | Lender Warrants [Member] | Convertible promissory notes [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Exercise price of warrant per share             $ 7.43
Warrants exercisable             13,468
Sales Agreement with Stifel [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares sold under sales agreement   0   0      
Sales Agreement with Stifel [Member] | Maximum [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock, value of shares issued $ 35,000,000            
Percentage of commission of gross sales price per share 3.00%            
Sales Agreement with Stifel [Member] | Other Assets [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Legal and accounting costs incurred   $ 100,000   $ 100,000