Related Party Transactions - Additional Information (Details) - Private Placement |
6 Months Ended |
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Jun. 30, 2018
USD ($)
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| Longitude Venture Partners III, L..P. | |
| Related Party Transaction [Line Items] | |
| Ownership percentage of merger company | 15.30% |
| Investments | $ 20,000,000 |
| CDK Associates, L.L.C. | |
| Related Party Transaction [Line Items] | |
| Ownership percentage of merger company | 4.99% |
| Investments | $ 7,000,000 |
| Excel Venture Fund II, L.P. | |
| Related Party Transaction [Line Items] | |
| Investments | $ 333,000 |
| Excel Venture Fund II, L.P. | Minimum | |
| Related Party Transaction [Line Items] | |
| Ownership percentage of merger company | 5.00% |
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