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Debt - Additional Information (Details) - USD ($) |  | 6 Months Ended
--- | --- | ---
Apr. 27, 2018 | Jun. 30, 2018
Debt Instrument [Line Items] |  |
Maximum amount available under second draw |  | $ 15,000,000
Amortization of debt discount |  | $ 138,000
Loan and Security Agreement | Silicon Valley Bank (SVB) |  |
Debt Instrument [Line Items] |  |
Loan and security agreement entered date |  | Apr. 27, 2018
Initial draw amount under agreement | $ 15,000,000 |
Remaining borrowing facility available date | Oct. 31, 2019 |
Frequency of amortization payments |  | Monthly
Date of first required payment of initial draw | Nov. 01, 2019 |
Extended date of first required payment if second draw funded | Apr. 01, 2020 |
Minimum fixed interest rate per annum | 8.31% |
Final interest rate payment on outstanding principal | 4.20% |
Principal and interest payment date | Mar. 01, 2022 |
Voluntary prepayment fee in first year | 3.00% |
Voluntary prepayment fee in second year | 2.00% |
Voluntary prepayment fee thereafter | 1.00% |
Loan and Security Agreement | Silicon Valley Bank (SVB) | Wall Street Journal Prime Rate |  |
Debt Instrument [Line Items] |  |
Basis spread on interest rate | 3.89% |
Loan and Security Agreement | Silicon Valley Bank (SVB) | Maximum |  |
Debt Instrument [Line Items] |  |
Maximum amount available under second draw | $ 15,000,000 |
Silicon Valley Bank and Life Sciences Fund II LLC |  |
Debt Instrument [Line Items] |  |
Percentage of purchase additional ordinary shares equal to term loan divided by applicable exercise price | 2.50% |
Silicon Valley Bank and Life Sciences Fund II LLC | Series B Convertible Preferred Shares |  |
Debt Instrument [Line Items] |  |
Number of warrants to purchase convertible preferred shares | 19,890 |
Warrants to purchase convertible preferred shares, exercise price | $ 18.85 |

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- Definition Class of warrant or right percentage of purchase of additional ordinary shares equal to term loan divided by exercise price called by each warrant or right. + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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