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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 01, 2020 | Feb. 21, 2020 | Jul. 31, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Jan. 01, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options granted (in shares) |  |  |  | 0 | 0 |  |
Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares exercised in period |  |  |  | $ 18,700 |  |  |
Total grant-date fair value of stock options vested |  |  |  | 1,800 |  |  |
Nonvested award options, unrecognized compensation expense |  |  |  | $ 6,300 |  |  |
Nonvested awards, period for recognition |  |  |  | 1 year 4 months 24 days |  |  |
Restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Nonvested awards, period for recognition |  |  |  | 3 years 2 months 12 days |  |  |
Cliff vesting period |  |  |  | 4 years |  |  |
Unrecognized stock-based compensation expense related to RSUs |  |  |  | $ 114,100 |  |  |
Restricted stock units | Vest in year one |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Cliff vesting period |  |  |  | 1 year |  |  |
Vesting percent |  |  |  | 25.00% |  |  |
Performance-based restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Service period (in years) |  |  |  | 4 years |  |  |
Performance-based restricted stock units | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percent |  |  |  | 0.00% |  |  |
Performance-based restricted stock units | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percent |  |  |  | 100.00% |  |  |
Restricted shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Nonvested awards, period for recognition |  |  |  | 1 year |  |  |
Unrecognized stock-based compensation expense related to RSUs |  |  |  | $ 10,300 |  |  |
Employee stock purchase plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized (in shares) |  |  | 750,000 | 72,892 |  |  |
Percentage increase of the number of common stock shares (in percentage) |  |  | 1.00% |  |  |  |
Shares available for grant (in shares) |  |  |  | 1,245,652 |  | 437,092 |
Unrecognized stock-based compensation expense related to RSUs |  |  |  | $ 400 |  |  |
ESPP share increase in period (in shares) |  |  | 750,000 |  |  |  |
Employee stock purchase plan period |  |  |  | 6 months |  |  |
Maximum employee subscription rate |  |  |  | 15.00% |  |  |
Maximum purchase value during offering period |  |  |  | $ 25,000 |  |  |
Denominator of lowest purchase of a participant (in shares) |  |  |  | 2,500 |  |  |
Purchase price of common stock (in percentage) |  |  |  | 85.00% |  |  |
Able Health Inc | Restricted shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Cliff vesting period |  | 1 year |  |  |  |  |
Number of restricted shares issued (in shares) |  | 179,392 |  |  |  |  |
Service period (in years) |  | 1 year |  |  |  |  |
Vitalware L L C |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  | 89,250 |  |  |
Number of restricted shares issued (in shares) | 203,997 |  |  |  |  |  |
Vitalware L L C | Restricted shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Nonvested awards, period for recognition |  |  |  | 4 months 24 days |  |  |
Cliff vesting period | 1 year |  |  |  |  |  |
Vesting percent | 25.00% |  |  |  |  |  |
Unrecognized stock-based compensation expense related to RSUs |  |  |  | $ 2,800 |  |  |
Number of restricted shares issued (in shares) | 203,997 |  |  |  |  |  |
Vitalware L L C | Restricted shares | Vest in year one |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Cliff vesting period | 1 year |  |  |  |  |  |
Vesting percent | 75.00% |  |  |  |  |  |
Stock Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  | 15,294,920 |  |  | 13,109,459
Shares available for grant (in shares) |  |  |  | 3,086,399 |  |  | 2,481,818
2011 Stock Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  | 2,756,607 |  |  |
Number of additional shares authorized (in shares) |  |  |  | 256,607 |  |  |
Percentage increase of the number of common stock shares (in percentage) |  |  |  | 5.00% |  |  |
2019 Stock Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  | 2,500,000 |  | 2,185,461 |

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