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Stockholders' Equity - Common Stock are Reserved for Future Issuance (Details) - shares
shares in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Warrants outstanding (in shares) 1,392 302 356
Stock options outstanding (in shares) 208 22 8
Options reserved for future issuance under the Company's 2019 Incentive Plan (in shares) 101    
Shares reserved for future issuance under the Employee Stock Purchase Plan (in shares) 8    
Total shares of common stock reserved for future issuance (in shares) 1,879    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units (in shares) 170 0