Three Months Ended June 30,

Six Months Ended June 30,

2019

2018

2019

2018

(in thousands)

Interest expense related to debt, including commitment fees

$

—

$

(84)

$

—

$

(257)

Deferred finance cost amortization

—

(131)

—

(191)

Interest income

201

22

388

31

Other interest expense not related to debt

—

163

—

33

Interest income (expense), net

$

201

$

(30)

$

388

$

(384)

Average effective interest rate, excluding commitment fees

0.00%

⁽¹⁾

8.21%

0.00%

⁽¹⁾

7.09%