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Stock Benefit Plans and Stock-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 05, 2020
May 31, 2017
Jul. 31, 2019
Sep. 30, 2016
Dec. 31, 2020
Dec. 31, 2019
Jun. 17, 2020
Apr. 08, 2020
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock reserved for future issuance         50,433,000        
Stock compensation charge         $ 900,000        
Stock-based compensation         $ 17,659,000 $ 10,956,000      
Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock issued         13,143,000 12,535,000      
Employee Stock Option                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock reserved for future issuance         3,951,000        
Weighted-average grant-date fair value of stock options granted         $ 4.71 $ 1.92      
Share price         $ 14.52        
Unrecognized compensation expense for stock options and awards expected to be recognized         $ 2,200,000        
Straight-line basis over a weighted average period         1 year 6 months 25 days        
Unvested Restricted Stock Award                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock reserved for future issuance         8,216,000        
Restricted shares granted under the plan         3,964,000        
Straight-line basis over a weighted average period         1 year 11 months 26 days        
Weighted average fair value of awards granted         $ 4.87 $ 1.92      
Unrecognized compensation expense for restricted stock and awards expected to be recognized         $ 22,100,000        
ESPP                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock reserved for future issuance         216,131        
Stock-based compensation         $ 1,000,000.0 $ 700,000      
Employee stock purchase plan, maximum annual compensation percentage   20.00%              
Employee stock purchase plan, maximum annual compensation amount   $ 21,250              
Purchase price equal to the lower of the fair market value per share (at closing) of Company common stock   85.00%              
Employee stock purchase plan, offering period   6 months              
Shares of common stock purchased under the ESPP         379,166 359,689      
2016 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock reserved for future issuance       1,083,333          
Number of shares available for grant         4,161,838   7,000,000    
2016 Equity Incentive Plan | Employee Stock Option                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expiration period       10 years          
Award vesting period       4 years          
Exercise price minimum percentage of market price on grant date       100.00%          
2016 Equity Incentive Plan | Employee Stock Option | 10 Percent Stockholder                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expiration period       5 years          
Exercise price minimum percentage of market price on grant date       110.00%          
Salary-to-Equity Conversion Program                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting date Jul. 10, 2020                
Deferred compensation liability         $ 900,000        
Salary-to-Equity Conversion Program | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Eligible employee payroll cost for conversion program $ 100,000                
Employee voluntary election to reduce compensation rate 10.00%                
Salary-to-Equity Conversion Program | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Employee voluntary election to reduce compensation rate 75.00%                
Inducement Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock reserved for future issuance         692,392        
Maximum award to be deductible other than options         $ 1,000,000.0        
2019 Management Objective Strategic Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock-based compensation         $ 200,000        
2019 Management Objective Strategic Incentive Plan | Board of Directors Chairman | Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share authorized grant of warrants     500,000            
Maximum grant of shares per participant     50,000            
2019 Management Objective Strategic Incentive Plan | Unvested Restricted Stock Award                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Maximum grant of shares per participant         25,000        
Restricted shares granted under the plan         130,000        
2017 Distributor Inducement Plan | Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock-based compensation         $ 500,000 $ 400,000      
Common stock issued         220,000        
Number of warrants available to be granted         525,000        
2017 Distributor Inducement Plan | Board of Directors Chairman | Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share authorized grant of warrants                 1,000,000
2017 Distributor Inducement Plan | Restricted Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Restricted shares granted under the plan         284,500        
Two Thousand Seventeen Development Services Plan | Board of Directors Chairman | Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares available for grant               7,000,000  
Common stock issued         0        
Two Thousand Seventeen Development Services Plan | Restricted Common Stock | Board of Directors Chairman                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares available for grant         5,769,000        
Restricted shares granted under the plan         3,190,000