Three Months Ended September 30,

Nine Months Ended September 30,

2021

2020

2021

2020

Components of lease cost

Finance lease cost components:

Amortization of finance lease assets

$

268

$

150

$

709

$

435

Interest on finance lease liabilities

92

64

265

139

Total finance lease costs

360

214

974

574

Operating lease cost components:

Operating lease cost

741

764

2,260

2,340

Short-term lease cost

166

196

540

483

Variable lease cost (1)

220

198

647

586

Sublease income

(47

)

(45

)

(140

)

(136

)

Total operating lease costs

1,080

1,113

3,307

3,273

Total lease cost

$

1,440

$

1,327

$

4,281

$

3,847

Supplemental cash flow information related to our operating leases is as follows for the nine months ended September 30, 2021 and 2020:

Cash paid for amounts included in the measurement of lease liabilities:

Operating cash outflow from operating leases

$

2,722

$

2,638

Weighted-average remaining lease term-finance leases at end of period (in years)

2.0

1.7

Weighted-average remaining lease term-operating leases at end of period (in years)

9.1

10.2

Weighted-average discount rate-finance leases at end of period

6.4

%

8.9

%

Weighted-average discount rate-operating leases at end of period

8.6

%

8.9

%