XML 74 R62.htm IDEA: XBRL DOCUMENT v3.21.1
Stock-Based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Mar. 31, 2014
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Total shares reserved for future issuance         7,101,126 8,874,291
Proceeds from stock options exercised         $ 1,176,000 $ 4,086,000
Proceeds from exercises of warrants   $ 35,200,000     $ 0 $ 35,151,000
2015 Equity Incentive Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Total shares reserved for future issuance         10,200,000  
Common stock reserved for future grants         7,200,000  
Additional Shares that may be added to shares reserved for issuance         1,100,000  
Employee Stock Option            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation vested and exercisable options outstanding         4,345,497  
Share-based compensation grants         400,000 0
Total shares reserved for future issuance         4,996,284 6,080,483
Unrecognized compensation cost related to unvested stock options         $ 1,300,000  
Remaining weighted-average period for recognition         10 months 24 days  
Aggregate intrinsic value of stock option exercised         $ 12,700,000 $ 200,000
Proceeds from stock options exercised         $ 1,200,000 $ 4,100,000
Stock options, vested and exercisable         4,345,497 3,973,614
Employee Stock Option | 2014 Equity Incentive Plan | Common Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Common stock reserved for issuance     11,109,000      
Share-based compensation vested and exercisable options outstanding         1,100,000  
Share-based compensation grants         0  
Employee Stock Option | 2014 Equity Incentive Plan | Common Stock | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation, expiration period     10 years      
Employee Stock Option | 2015 Equity Incentive Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Additional common shares reserved for future issuance 3,000,000     3,000,000    
Non Employee Restricted Stock Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Remaining weighted-average period for recognition         2 months 12 days  
Grants of restricted stock         0  
Unrecognized compensation cost related to non-vested stock options         $ 6,400  
Outstanding RSUs            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Total shares reserved for future issuance         466,842 1,155,808
Remaining weighted-average period for recognition         1 year 9 months 18 days  
Grants of restricted stock         33,500 749,793
Unrecognized compensation cost related to non-vested stock options         $ 600,000  
Employee Restricted Stock Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Remaining weighted-average period for recognition         1 year 10 months 24 days  
Unrecognized compensation cost related to non-vested stock options         $ 600,000