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Commitments and Contingencies - Notes Payable (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Mar. 31, 2017 | Sep. 30, 2017
Notes Payable |  |  |  |  |  |  |  |  |  |
Notes paid in cash |  |  |  |  |  |  |  |  |  | $ 600
2016 License Agreements |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |
Market Capitalization |  |  | $ 1,000,000 |  |  | $ 750,000 |  | $ 1,000,000 | $ 750,000 |
Broad and Wageningen University | 2016 License Agreements |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Promissory notes issued |  |  |  |  |  |  |  |  | $ 5,000 |
Broad and Wageningen University | Cpf1 License Agreement |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Promissory notes issued |  |  |  |  |  |  | $ 10,000 |  |  |
Interest rate (as a percentage) |  |  |  |  |  |  | 4.80% |  |  |
Success Payments |  |  |  |  |  | 5,000 |  |  |  |
Broad and Wageningen University | Cpf1 License Agreement | Success Payment Notes |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Promissory notes issued |  |  |  |  |  | $ 5,000 |  |  |  |
Broad | 2016 License Agreements |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Promissory notes issued |  |  | 7,500 |  |  |  |  |  |  |
Broad | Cpf1 License Agreement |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  | 371,166 | 108,104 |  |  |  |  |
Broad | Cpf1 License Agreement | Success Payment Notes |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Promissory notes issued |  |  | 7,500 |  |  |  |  |  |  |
Common stock issued |  | 225,909 |  |  | 271,347 |  |  |  |  |
Success Payments |  |  | $ 7,500 |  |  |  |  |  |  |
Broad | Sponsored Research Agreement |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Promissory notes issued | $ 12,500 |  |  |  |  |  |  |  |  |
Common stock issued | 330,617 |  |  |  |  |  |  |  |  |
Broad | Sponsored Research Agreement | Initial Notes |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Promissory notes issued | $ 12,500 |  |  |  |  |  |  |  |  |
Interest rate (as a percentage) | 4.80% |  |  |  |  |  |  |  |  |
Wageningen University | Cpf1 License Agreement |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Notes paid in cash |  |  |  |  | $ 200 |  |  |  |  |
Wageningen University | Cpf1 License Agreement | Success Payment Notes |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Notes paid in cash |  |  |  |  | $ 400 |  |  |  |  |
The General Hospital (MGH) | 2016 License Agreements |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |
Success Payments |  |  |  |  |  |  |  | $ 2,000 |  |

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