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Business Agreements (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2017 USD ($) treatment | Dec. 18, 2013 USD ($) | Dec. 31, 2013 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) treatment shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2017
Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | $ 295,000 | $ 653,000 | $ 277,000 |
Amount contributed |  | $ 1,500,000 | $ 1,500,000 |  |  |  |  |  |  |  |
Equity interest |  | 50.00% | 50.00% |  |  |  |  |  |  |  |
Percentage of ownership control with disputes resolved through arbitration |  | 50.00% | 50.00% |  |  |  |  |  |  |  |
Voting rights |  |  |  |  |  |  |  | 50.00% |  |  |
Loss from equity method investment |  |  |  | $ (4,000) | $ (454,000) | $ (4,000) | $ (875,000) | $ (1,018,000) | (1,542,000) | (1,561,000) |
Investment in joint venture |  |  |  | 142,000 |  | 142,000 |  | 146,000 | 65,000 |  |
Additional contribution in joint venture |  |  |  |  |  |  |  | 1,100,000 | 1,750,000 | 1,500,000 |
OvaXon, LLC |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |
Equity interest |  |  |  |  |  |  |  |  |  |  | 50.00%
Loss from equity method investment |  |  |  | $ 0 | $ (500,000) | $ 0 | $ 900,000 | (1,000,000) | (1,500,000) | $ (1,500,000) |
Investment in joint venture |  |  |  |  |  |  |  | $ 100,000 | 100,000 |  |
OvaTure Collaboration |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |
Period of commercial milestone payment after the first commercial sale of collaborative arrangement |  |  |  |  |  |  |  | 3 months |  |  |
MGH and Harvard |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |
License and patent-related fees |  |  |  |  |  |  |  | $ 400,000 |  |  |
Contingent milestone payments |  |  |  |  |  |  |  | 10,700,000 |  |  |
IVF Japan |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |
Initial term of agreement (in years) | 1 year |  |  |  |  |  |  |  |  |  |
Period of material breach (in years) | 30 days |  |  |  |  |  |  |  |  |  |
Fixed fee revenue per treatment cycle | $ 1,000 |  |  |  |  |  |  |  |  |  |
Reimbursed amount of lab operations and personnel costs | $ 200,000 |  |  |  |  |  |  | 55,000 |  |  |
Number of excess treatment cycles | treatment | 100 |  |  |  |  |  |  |  |  |  |
Fixed fee revenue per excess treatment cycle | $ 2,000 |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | 63,400 |  |  |
Fees for treatment cycles | $ 50,000 |  |  |  |  |  |  | $ 8,400 |  |  |
IVF Japan | Minimum |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |
Number of excess treatment cycles | treatment |  |  |  |  |  |  |  | 50 |  |  |
Intrexon |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |
Amount contributed |  | $ 1,500,000 |  |  |  |  |  |  |  |  |
Equity interest |  | 50.00% |  |  |  |  |  |  |  |  |
Percentage of ownership control with disputes resolved through arbitration |  | 50.00% |  |  |  |  |  |  |  |  |
Additional contribution in joint venture |  |  |  |  |  |  |  | $ 1,100,000 | $ 1,800,000 |  |
Intrexon | OvaTure Collaboration |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock shares upon execution of collaborative arrangements (in shares) | shares |  |  |  |  |  |  |  | 273,224 |  |  |
Vesting of Founders Stock |  |  |  |  |  |  |  | $ 2,500,000 |  |  |
Technology access fee payable in cash upon specified passage of time |  |  |  |  |  |  |  | $ 2,500,000 |  |  |

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