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Period from grant date that an equity-based award expires if the drug is not approved, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period of time between issuance and maturity of bond, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share-Based Payments - 2017 Share Incentive Plan (Details) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 26, 2017 shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) item $ / shares shares	Jun. 30, 2018 USD ($)
Stock-Based Compensation Expense
Share-based compensation expense \| $				$ 3,728	$ 2,011
2017 Share Incentive Plan
Options
Outstanding at beginning of year (in shares)				2,398,425
Granted (in shares)				2,218,300
Forfeited (in shares)				(98,650)
Outstanding at end of year (in shares)		4,518,075		4,518,075
Vested and exercisable at end of year (in shares)		817,682		817,682
Weighted average exercise price in $ per share
Outstanding balance at beginning of year (in dollars per share) \| $ / shares				$ 5.41
Granted (in dollars per share) \| $ / shares				1.91
Forfeited (in dollars per share) \| $ / shares				4.14
Outstanding balance at end of year (in dollars per share) \| $ / shares		$ 3.72		3.72
Vested and exercisable balance at end of year (in dollars per share) \| $ / shares		$ 6.03		$ 6.03
Aggregate intrinsic value
Aggregate intrinsic value, outstanding \| $		$ 1,245		$ 1,245
2017 Share Incentive Plan \| Stock Options
Share-Based Payments
Vesting period				10 years
Fair Value Assumptions
Expected term of options (in years)				6 years 1 month 6 days
Dividend yield (as a percent)				0.00%
Weighted-average remaining contractual life				9 years 1 month 6 days
Stock-Based Compensation Expense
Share-based compensation expense \| $		800	$ 300	$ 1,300	$ 700
Weighted-average grant date fair value (in dollars per share) \| $ / shares				$ 1.12
Unrecognized compensation expense
Total unrecognized compensation related to unvested options \| $		6,700		$ 6,700
Recognition period				3 years 9 months 18 days
2017 Share Incentive Plan \| Stock Options \| Minimum
Fair Value Assumptions
Expected volatility (as a percent)				61.40%
Risk-free interest rate (as a percent)				2.34%
Term of U.S. treasury securities used to estimate risk free interest rate				5 years
2017 Share Incentive Plan \| Stock Options \| Maximum
Fair Value Assumptions
Expected volatility (as a percent)				61.80%
Risk-free interest rate (as a percent)				2.58%
Term of U.S. treasury securities used to estimate risk free interest rate				7 years
2017 Share Incentive Plan \| SARs
Share-Based Payments
Vesting period				10 years
2017 Share Incentive Plan \| Restricted Stock Units ("RSUs")
Share-Based Payments
Vesting period				4 years
Expiration period if drug is not approved				2 years
Stock-Based Compensation Expense
Share-based compensation expense \| $		$ 57		$ 95
Restricted Stock Units
Restricted stock granted during the period				479,000
Weighted average grant date fair value per share \| $ / shares				$ 1.90
Number of shares vested				256,709
Number of shares outstanding		479,000		479,000
2017 Share Incentive Plan \| Restricted Stock Units ("RSUs") \| Vesting period, year one
Restricted Stock Units
Percentage that vests during the period				25.00%
2017 Share Incentive Plan \| Restricted Stock Units ("RSUs") \| Vesting subject to FDA approval of NDA for lefamulin
Stock-Based Compensation Expense
Share-based compensation expense \| $				$ 0
Restricted Stock Units
Aggregate number of shares granted under the plan		371,550		371,550
Weighted average grant date fair value per share \| $ / shares				$ 6.13
Number of shares outstanding		346,450		346,450
2017 Share Incentive Plan \| Restricted Stock Units ("RSUs") \| Immediate vesting upon regulatory approval
Restricted Stock Units
Percentage that vests during the period				50.00%
2017 Share Incentive Plan \| Restricted Stock Units ("RSUs") \| Vesting upon the one-year-anniversary of FDA approval
Restricted Stock Units
Percentage that vests during the period				50.00%
2017 Share Incentive Plan \| Restricted Stock Units ("RSUs") \| Vesting subject to FDA approval of NDA for lefamulin and CONTEPO
Stock-Based Compensation Expense
Share-based compensation expense \| $				$ 0
Restricted Stock Units
Aggregate number of shares granted under the plan		35,600		35,600
Weighted average grant date fair value per share \| $ / shares				$ 2.56
2017 Share Incentive Plan \| Restricted Stock Units ("RSUs") \| Employees
Share-Based Payments
Number of vesting periods \| item				3
Vesting period				6 months
Stock-Based Compensation Expense
Share-based compensation expense \| $		$ 300		$ 500
Weighted-average grant date fair value (in dollars per share) \| $ / shares				$ 2.16
Restricted Stock Units
Aggregate number of shares granted under the plan		834,300		834,300
Number of shares outstanding		513,591		513,591
2017 Share Incentive Plan \| Ordinary Shares
Share-Based Payments
Number of shares authorized	3,000,000
Additional shares authorized	3,438,990
Shares available for grant		7,116,727		7,116,727
2017 Share Incentive Plan \| Ordinary Shares \| Minimum
Share-Based Payments
Annual increase, to be added on the first day of each fiscal year (in shares)	2,000,000
Annual increase, to be added on the first day of each fiscal year (as a percent)	4.00%