Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

Stock-based compensation expense includes stock options, restricted stock awards, and restricted stock units granted to employees and other service providers and has been reported in the Company’s consolidated statements of operations depending on the function performed by the employee or other service provider. Stock-based compensation expense recognized in the consolidated statements of operations was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Veterinary invoice expense	$	169	$	153	$	515	$	421
Other cost of revenue	89		96		268		277
Technology and development	94		58		267		167
General and administrative	916		634		2,452		1,708
Sales and marketing	577		358		1,573		980
Total stock-based compensation	$	1,845	$	1,299	$	5,075	$	3,553

As of September 30, 2019, the Company had 261,075 unvested stock options and 605,568 unvested restricted stock awards and restricted stock units that are expected to vest. Stock-based compensation expenses of $1.8 million related to unvested stock options and $15.8 million related to unvested restricted stock awards and restricted stock units are expected to be recognized over a weighted average period of approximately 1.4 years and 3.1 years, respectively.

Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of the Company's stock option activity is as follows:

	Number of Options		Weighted Average Exercise Price per Share		Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2018	2,621,503		$	9.01	$	43,136
Granted	—		—		—
Exercised	(412,742	)	4.68		10,705
Forfeited	(9,548	)	18.19		—
Outstanding as of September 30, 2019	2,199,213		9.78		34,401
Exercisable as of September 30, 2019	1,938,138		$	8.79	$	32,243

As of September 30, 2019, stock options outstanding and stock options exercisable had a weighted average remaining contractual life of 5.3 years and 5.0 years, respectively.

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

A summary of the Company’s restricted stock award and restricted stock unit activity is as follows:

	Number of  Shares		Weighted Average Grant Date Fair Value per Share
Unvested shares as of December 31, 2018	451,160		$	22.16
Granted	421,325		29.95
Vested	(243,975	)	16.94
Forfeited	(22,942	)	29.41
Unvested shares as of September 30, 2019	605,568		$	29.40