Stockholders' Equity - Shares of Common Stock Available for Future Issuance (Details)	Jun. 30, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award
Shares of Common Stock Available for Future Issuance	1,394,454
Directors' Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares of Common Stock Available for Future Issuance	24,166
2016 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares of Common Stock Available for Future Issuance	426,288
2016 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares of Common Stock Available for Future Issuance	944,000