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Share-Based Compensation (Details)
$ / shares in Units, $ in Thousands

3 Months Ended

6 Months Ended

9 Months Ended

12 Months Ended

Sep. 30, 2018

USD ($)

shares

Jun. 30, 2018

USD ($)

shares

Sep. 30, 2017

USD ($)

Jun. 30, 2018

shares

Sep. 30, 2018

USD ($)

Plan

Period

$ / shares

shares

Sep. 30, 2017

USD ($)

Dec. 31, 2017

shares

Share-based Compensation expenses [Abstract]

Share-based compensation

$ 1,236

$ 28,541

Performance Unit and Option Awards [Abstract]

Common stock, shares outstanding (in shares) | shares

24,942,185

24,942,185

Manufacturing and Supply [Member]

Share-based Compensation expenses [Abstract]

Share-based compensation

$ 32

$ 377

Research and Development [Member]

Share-based Compensation expenses [Abstract]

Share-based compensation

192

2,378

Selling, General and Administrative [Member]

Share-based Compensation expenses [Abstract]

Share-based compensation

$ 1,012

$ 25,786

Discount for Lack of Marketability [Member]

Valuation Assumptions for Determination of Fair Value [Abstract]

Valuation assumptions

0.34

0.34

Volatility [Member]

Valuation Assumptions for Determination of Fair Value [Abstract]

Valuation assumptions

0.9

0.9

Weighted Average Cost of Capital [Member]

Valuation Assumptions for Determination of Fair Value [Abstract]

Valuation assumptions

0.2750

0.2750

Performance Units [Member]

Performance Unit and Option Awards [Abstract]

Number of performance units plans | Plan

2

Restricted Stock Units [Member]

Share-based Compensation expenses [Abstract]

Share-based compensation

$ 610

^[1]

$ 0

$ 610

^[1]

$ 0

Valuation Assumptions for Determination of Fair Value [Abstract]

Service period

2 years

Additional Disclosures [Abstract]

Stock granted (in shares) | shares

264,781

0

0

Estimated grant date fair value

$ 3,926

$ 3,926

Stock vested (in shares) | shares

29,802

Restricted stock unit forfeited (in shares) | shares

0

Compensation Cost Not yet Recognized [Abstract]

Unrecognized compensation expense, net of estimated forfeitures

$ 3,043

$ 3,043

Term of Unrecognized compensation expense to be recognized

3 years

Restricted Stock Units [Member] | Senior Management and Board [Member]

Additional Disclosures [Abstract]

Vesting period

2 years

Restricted Stock Units [Member] | key Employees [Member]

Additional Disclosures [Abstract]

Vesting period

3 years

Stock Options [Member]

Share-based Compensation expenses [Abstract]

Share-based compensation

^[1]

$ 626

$ 633

Valuation Assumptions for Determination of Fair Value [Abstract]

Service period

3 years

Additional Disclosures [Abstract]

Vesting period

3 years

Stock options granted (in shares) | shares

1,033,042

0

Stock options, estimated grant date fair value

$ 11,155

$ 11,155

Stock options vested (in shares) | shares

28,666

Contractual term

10 years

Stock options forfeited (in shares) | shares

0

Fair Value Assumptions [Abstract]

Expected dividend yield

0.00%

Expected volatility

90.00%

Number of vesting periods | Period

2

Compensation Cost Not yet Recognized [Abstract]

Unrecognized compensation expense, net of estimated forfeitures

$ 9,770

$ 9,770

Term of Unrecognized compensation expense to be recognized

3 years

Stock Options [Member] | Minimum [Member]

Additional Disclosures [Abstract]

Stock options grand, exercise price (in dollars per share) | $ / shares

$ 6.54

Fair Value Assumptions [Abstract]

Expected term (years)

5 years 9 months 18 days

Risk-free rate

2.80%

Stock Options [Member] | Maximum [Member]

Additional Disclosures [Abstract]

Stock options grand, exercise price (in dollars per share) | $ / shares

$ 18.67

Fair Value Assumptions [Abstract]

Expected term (years)

6 years 1 month 6 days

Risk-free rate

2.90%

Stock Options [Member] | Senior Management and Board [Member]

Additional Disclosures [Abstract]

Vesting period

3 years

Stock Options [Member] | key Employees [Member]

Additional Disclosures [Abstract]

Vesting period

3 years

Nonvoting Common Stock [Member]

Share-based Compensation expenses [Abstract]

Share-based compensation

$ 0

^[2]

$ 27,298

$ 27,298

^[2]

Performance Unit and Option Awards [Abstract]

Fair market value of non-voting shares at shares granted date

19,934

Withholding taxes on share-based compensation

$ 7,364

Number of common shares issued (in shares) | shares

4,922,353

Common stock, shares outstanding (in shares) | shares

4,922,353

4,922,353

[1]	Share-Based Compensation Equity Awards
[2]	Non-Voting Common Share Issuance

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