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Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 2,460 $ 2,422
Plan options contractual life (up to) 10 years  
Award vesting period 4 years  
Service Based Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years 4 years
Stock options to purchase shares (in shares) 1,146,258 1,686,800
Weighted average grant date fair value (usd per share) $ 3.44 $ 4.67
Estimated weighted-average amortization period 2 years 6 months  
Unrecognized cost related to unvested RSUs expected to vest $ 19,423  
Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years  
Granted (in shares) 1,290,203  
Restricted shares fair value at grant date (usd per share) $ 5.41  
Restricted Stock Units, Service-Based    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated weighted-average amortization period 4 years  
Granted (in shares) 718,150  
Unrecognized cost related to unvested RSUs expected to vest $ 3,806  
Restricted Stock Units, Performance-Based    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 572,053  
Unrecognized cost related to unvested RSUs expected to vest $ 3,095  
NASDAQ Inducement Grant Exception | Service Based Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options to purchase shares (in shares) 90,000  
NASDAQ Inducement Grant Exception | Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 60,000  
2017 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 150 $ 114
Inventory    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 38  
Prepaid expenses and other assets    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 1