Quarter Ended

March 31

June 30

September 30

December 31

Year ended December 31, 2021

Total revenues

$

53,284

$

56,191

$

56,693

$

56,440

Gross margin

$

24,550

$

25,402

$

23,513

$

23,113

Loss from operations

$

(1,142)

$

(3,748)

$

(4,576)

$

(8,362)

Net loss attributable to common stockholders

$

(5,723)

$

(7,389)

$

(8,526)

$

(262,086)

Net loss per share attributable to common stockholders - basic and diluted

$

(0.13)

$

(0.16)

$

(0.18)

$

(5.46)

Year ended December 31, 2020

Total revenues

$

9,774

$

9,389

$

11,172

$

48,361

Gross margin

$

5,258

$

5,127

$

6,055

$

19,894

Loss from operations

$

(3,586)

$

(5,845)

$

(10,732)

$

(9,847)

Net loss attributable to common stockholders

$

(3,943)

$

(5,803)

$

(11,418)

$

(53,866)

Net loss per share attributable to common stockholders - basic and diluted

$

(0.11)

$

(0.15)

$

(0.29)

$

(1.32)

Year ended December 31, 2019

Total revenues

$

6,653

$

8,464

$

9,583

$

9,242

Gross margin

$

3,454

$

4,338

$

4,627

$

4,932

Loss from operations

$

(2,141)

$

(2,304)

$

(12,352)

$

(878)

Net loss

$

(2,387)

$

(2,528)

$

(12,469)

$

(948)

Net loss per share - basic and diluted

$

(0.08)

$

(0.08)

$

(0.35)

$

(0.03)