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Fair Value Considerations (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Summary of fair value financial assets measured on a recurring basis

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​

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(Level 1)

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(Level 2)

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(Level 3)

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Total

June 30, 2020

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​

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Assets:

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​

​

​

​

​

​

​

​

​

​

​

Money market funds

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$

32,512

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$

—

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$

—

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$

32,512

U.S. government securities

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​

4,548

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​

—

​

​

—

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​

4,548

Corporate bonds

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—

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​

8,136

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​

—

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​

8,136

Commercial paper

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—

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​

9,386

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​

—

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​

9,386

Asset-backed securities

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​

—

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​

3,605

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​

—

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​

3,605

Total assets

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$

37,060

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$

21,127

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$

—

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$

58,187

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Liabilities

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Debt derivative liability

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$

—

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$

—

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$

2,387

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$

2,387

Common stock derivative option liability

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​

—

​

​

—

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​

176

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​

176

Total liabilities

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$

—

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$

—

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$

2,563

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$

2,563

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(Level 1)

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(Level 2)

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(Level 3)

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Total

December 31, 2019

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Assets:

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​

​

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​

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​

​

Money market funds

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$

26,812

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$

—

​

$

—

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$

26,812

U.S. government securities

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​

4,544

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​

—

​

​

—

​

​

4,544

Corporate bonds

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​

—

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17,754

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​

—

​

​

17,754

Commercial paper

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​

—

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​

24,679

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​

—

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​

24,679

Asset-backed securities

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​

—

​

​

13,808

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​

—

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​

13,808

Total assets

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$

31,356

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$

56,241

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$

—

​

$

87,597

Schedule of the fair value of instruments classified as Level 3 measurements

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Year Ending December 31, 2020

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Beginning Balance

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$

—

Option to purchase shares

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​

176

Fair Value of Derivative Feature

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​

2,387

Ending Balance, June 30, 2020

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$

2,563

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Debt derivative liability  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Schedule of valuation of the debt derivative liability

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June 30, 2020

Input

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Remaining term (years)

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7.0 years

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Maturity date

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June 30, 2027

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Coupon rate

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9.50%

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Revenue participation payments

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Maximum each year

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Discount rate

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​

10.83%

(1)

Probability of mandatory prepayment before 2024

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​

5.0%

(1)

Estimated timing of mandatory prepayment event before 2024

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December 31, 2023

(1)

Probability of mandatory prepayment 2024 or after

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​

15.0%

(1)

Estimated timing of mandatory prepayment event 2024 or after

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​

March 31, 2026

(1)

Probability of optional prepayment event

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​

5.0%

(1)

Estimated timing of optional prepayment event

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​

December 31, 2025

(1)

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June 30, 2020

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Input

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Option term

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7.0 years

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Company stock price

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$

9.24

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Risk free rate

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0.49%

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Equity volatility

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​

60%

(1)

Simulation trials

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​

100,000

​