Stock-based Awards

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Stock Options

A summary of the Company’s stock option activity for the six months ended June 30, 2021 is as follows:


	Number of Options	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life
				(in years)
Outstanding at December 31, 2020	10,009,282	$	9.58	5.1
Granted	768,354	5.04
Exercised	(387,052)	3.47
Forfeited/expired	(1,078,734)	8.34
Outstanding at June 30, 2021	9,311,850	$	9.60	4.4

At June 30, 2021, total remaining stock-based compensation expense for unvested stock option awards was $5.2 million, which is expected to be recognized over a weighted-average period of 2.9 years. For the three months ended June 30, 2021 and 2020, the Company recorded stock-based compensation expense for stock option awards of $1.0 million and $1.4 million, respectively. For the six months ended June 30, 2021 and 2020, the Company recorded stock-based compensation expense for stock option awards of $2.6 million and $3.0 million, respectively.

Restricted Stock Units

Activity in connection with restricted stock units is as follows for the six months ended June 30, 2021:


	Number of Shares	Weighted- Average Grant Date Fair Value
Non-vested — December 31, 2020	6,918,474	$	4.63
Granted	5,007,558	4.81
Vested	(1,911,185)	4.78
Forfeited	(1,441,562)	4.55
Non-vested — June 30, 2021	8,573,285	$	4.71

At June 30, 2021, total remaining stock-based compensation expense for non-vested restricted stock units was $37.0 million, which is expected to be recognized over a weighted-average period of 2.8 years. For the three months ended June 30, 2021 and 2020, the Company recorded $4.2 million and $4.8 million in stock-based compensation expense for restricted stock units, respectively. For the six months ended June 30, 2021 and 2020, the Company recorded stock-based compensation expense for restricted stock units of $8.9 million and $9.1 million, respectively.

Stock-based Compensation Cost

The Company recorded stock-based compensation cost relating to stock options and restricted stock units in the following categories on the accompanying condensed consolidated statements of comprehensive loss (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Cost of revenue	$	66	$	42	$	137	$	355
Sales and marketing	1,512		2,279		4,471		4,440
Technology and development	1,159		1,320		2,347		2,545
General and administrative	2,420		2,470		4,587		4,685
Total stock-based compensation expense	5,157		6,111		11,542		12,025
Amount capitalized to internal software use	350		355		697		700
Total stock-based compensation cost	$	5,507	$	6,466	$	12,239	$	12,725